<P> The 21st Diplomatic Session, held from 5 to 23 November 2007, led to the adoption of two new instruments: the Convention of 23 November 2007 on the International Recovery of Child Support and Other Forms of Family Maintenance and the Protocol of 23 November 2007 on the Law Applicable to Maintenance Obligations . </P> <P> Hans van Loon, Secretary General from 1996 to 2013, was succeeded by Christophe Bernasconi on 1 July 2013 . </P> <Table> <Tr> <Th> State </Th> <Th> Member since </Th> </Tr> <Tr> <Td> Albania </Td> <Td> 2002 - 06 - 04! 4 June 2002 </Td> </Tr> <Tr> <Td> Andorra </Td> <Td> 2015 - 06 - 11! 11 June 2015 </Td> </Tr> <Tr> <Td> Argentina </Td> <Td> 1972 - 04 - 28! 28 April 1972 </Td> </Tr> <Tr> <Td> Armenia </Td> <Td> 2015 - 04 - 28! 28 April 2015 </Td> </Tr> <Tr> <Td> Australia </Td> <Td> 1973 - 11 - 01! 1 November 1973 </Td> </Tr> <Tr> <Td> Austria </Td> <Td> 1955 - 07 - 15! 15 July 1955 </Td> </Tr> <Tr> <Td> Azerbaijan </Td> <Td> 2014 - 07 - 29! 29 July 2014 </Td> </Tr> <Tr> <Td> Belarus </Td> <Td> 2001 - 07 - 12! 12 July 2001 </Td> </Tr> <Tr> <Td> Belgium </Td> <Td> 1955 - 07 - 15! 15 July 1955 </Td> </Tr> <Tr> <Td> Bosnia and Herzegovina </Td> <Td> 2001 - 06 - 07! 7 June 2001 </Td> </Tr> <Tr> <Td> Brazil </Td> <Td> 2001 - 02 - 23! 23 February 2001 </Td> </Tr> <Tr> <Td> Bulgaria </Td> <Td> 1999 - 04 - 22! 22 April 1999 </Td> </Tr> <Tr> <Td> Burkina Faso </Td> <Td> 2013 - 10 - 16! 16 October 2013 </Td> </Tr> <Tr> <Td> Canada </Td> <Td> 1968 - 10 - 07! 7 October 1968 </Td> </Tr> <Tr> <Td> Chile </Td> <Td> 1986 - 04 - 25! 25 April 1986 </Td> </Tr> <Tr> <Td> China </Td> <Td> 1987 - 07 - 03! 3 July 1987 </Td> </Tr> <Tr> <Td> Costa Rica </Td> <Td> 2011 - 01 - 27! 27 January 2011 </Td> </Tr> <Tr> <Td> Croatia </Td> <Td> 1995 - 06 - 12! 12 June 1995 </Td> </Tr> <Tr> <Td> Cyprus </Td> <Td> 1984 - 10 - 08! 8 October 1984 </Td> </Tr> <Tr> <Td> Czech Republic </Td> <Td> 1993 - 01 - 28! 28 January 1993 </Td> </Tr> <Tr> <Td> Denmark </Td> <Td> 1955 - 07 - 15! 15 July 1955 </Td> </Tr> <Tr> <Td> Ecuador </Td> <Td> 2007 - 11 - 02! 2 November 2007 </Td> </Tr> <Tr> <Td> Egypt </Td> <Td> 1961 - 04 - 24! 24 April 1961 </Td> </Tr> <Tr> <Td> Estonia </Td> <Td> 1998 - 05 - 13! 13 May 1998 </Td> </Tr> <Tr> <Td> European Union </Td> <Td> 2007 - 04 - 03! 3 April 2007 </Td> </Tr> <Tr> <Td> Finland </Td> <Td> 1955 - 12 - 02! 2 December 1955 </Td> </Tr> <Tr> <Td> France </Td> <Td> 1964 - 04 - 20! 20 April 1964 </Td> </Tr> <Tr> <Td> Georgia </Td> <Td> 2001 - 05 - 28! 28 May 2001 </Td> </Tr> <Tr> <Td> Germany </Td> <Td> 1955 - 12 - 14! 14 December 1955 </Td> </Tr> <Tr> <Td> Greece </Td> <Td> 1955 - 08 - 26! 26 August 1955 </Td> </Tr> <Tr> <Td> Hungary </Td> <Td> 1987 - 01 - 06! 6 January 1987 </Td> </Tr> <Tr> <Td> Iceland </Td> <Td> 2003 - 11 - 14! 14 November 2003 </Td> </Tr> <Tr> <Td> India </Td> <Td> 2008 - 03 - 13! 13 March 2008 </Td> </Tr> <Tr> <Td> Ireland </Td> <Td> 1955 - 08 - 26! 26 August 1955 </Td> </Tr> <Tr> <Td> Israel </Td> <Td> 1964 - 09 - 24! 24 September 1964 </Td> </Tr> <Tr> <Td> Italy </Td> <Td> 1957 - 06 - 26! 26 June 1957 </Td> </Tr> <Tr> <Td> Japan </Td> <Td> 1957 - 06 - 27! 27 June 1957 </Td> </Tr> <Tr> <Td> Jordan </Td> <Td> 2001 - 06 - 13! 13 June 2001 </Td> </Tr> <Tr> <Td> Latvia </Td> <Td> 1992 - 08 - 11! 11 August 1992 </Td> </Tr> <Tr> <Td> Lithuania </Td> <Td> 2001 - 10 - 23! 23 October 2001 </Td> </Tr> <Tr> <Td> Luxembourg </Td> <Td> 1956 - 03 - 12! 12 March 1956 </Td> </Tr> <Tr> <Td> Malaysia </Td> <Td> 2002 - 10 - 02! 2 October 2002 </Td> </Tr> <Tr> <Td> Malta </Td> <Td> 1995 - 01 - 30! 30 January 1995 </Td> </Tr> <Tr> <Td> Mauritius </Td> <Td> 2011 - 01 - 19! 19 January 2011 </Td> </Tr> <Tr> <Td> Mexico </Td> <Td> 1986 - 03 - 18! 18 March 1986 </Td> </Tr> <Tr> <Td> Monaco </Td> <Td> 1996 - 08 - 08! 8 August 1996 </Td> </Tr> <Tr> <Td> Montenegro </Td> <Td> 2007 - 03 - 01! 1 March 2007 </Td> </Tr> <Tr> <Td> Morocco </Td> <Td> 1993 - 09 - 06! 6 September 1993 </Td> </Tr> <Tr> <Td> Netherlands </Td> <Td> 1955 - 07 - 15! 15 July 1955 </Td> </Tr> <Tr> <Td> New Zealand </Td> <Td> 2002 - 02 - 05! 5 February 2002 </Td> </Tr> <Tr> <Td> Norway </Td> <Td> 1955 - 07 - 15! 15 July 1955 </Td> </Tr> <Tr> <Td> Panama </Td> <Td> 2002 - 05 - 29! 29 May 2002 </Td> </Tr> <Tr> <Td> Paraguay </Td> <Td> 2005 - 06 - 28! 28 June 2005 </Td> </Tr> <Tr> <Td> Peru </Td> <Td> 2001 - 01 - 29! 29 January 2001 </Td> </Tr> <Tr> <Td> Philippines </Td> <Td> 2010 - 07 - 14! 14 July 2010 </Td> </Tr> <Tr> <Td> Poland </Td> <Td> 1984 - 05 - 29! 29 May 1984 </Td> </Tr> <Tr> <Td> Portugal </Td> <Td> 1955 - 07 - 15! 15 July 1955 </Td> </Tr> <Tr> <Td> Republic of Korea </Td> <Td> 1997 - 08 - 20! 20 August 1997 </Td> </Tr> <Tr> <Td> Republic of Macedonia </Td> <Td> 1993 - 09 - 20! 20 September 1993 </Td> </Tr> <Tr> <Td> Republic of Moldova </Td> <Td> 2016 - 03 - 16! 16 March 2016 </Td> </Tr> <Tr> <Td> Romania </Td> <Td> 1991 - 04 - 10! 10 April 1991 </Td> </Tr> <Tr> <Td> Russia </Td> <Td> 2001 - 12 - 06! 6 December 2001 </Td> </Tr> <Tr> <Td> Saudi Arabia </Td> <Td> 2016 - 10 - 19! 19 October 2016 </Td> </Tr> <Tr> <Td> Serbia </Td> <Td> 2001 - 04 - 26! 26 April 2001 </Td> </Tr> <Tr> <Td> Singapore </Td> <Td> 2014 - 04 - 09! 09 April 2014 </Td> </Tr> <Tr> <Td> Slovakia </Td> <Td> 1993 - 04 - 26! 26 April 1993 </Td> </Tr> <Tr> <Td> Slovenia </Td> <Td> 1992 - 06 - 18! 18 June 1992 </Td> </Tr> <Tr> <Td> South Africa </Td> <Td> 2002 - 02 - 14! 14 February 2002 </Td> </Tr> <Tr> <Td> Spain </Td> <Td> 1955 - 07 - 15! 15 July 1955 </Td> </Tr> <Tr> <Td> Sri Lanka </Td> <Td> 2001 - 09 - 27! 27 September 2001 </Td> </Tr> <Tr> <Td> Suriname </Td> <Td> 1977 - 10 - 07! 7 October 1977 </Td> </Tr> <Tr> <Td> Sweden </Td> <Td> 1955 - 07 - 15! 15 July 1955 </Td> </Tr> <Tr> <Td> Switzerland </Td> <Td> 1957 - 05 - 06! 6 May 1957 </Td> </Tr> <Tr> <Td> Tunisia </Td> <Td> 2014 - 11 - 04! 4 November 2014 </Td> </Tr> <Tr> <Td> Turkey </Td> <Td> 1955 - 08 - 26! 26 August 1955 </Td> </Tr> <Tr> <Td> Ukraine </Td> <Td> 2003 - 12 - 03! 3 December 2003 </Td> </Tr> <Tr> <Td> United Kingdom </Td> <Td> 1955 - 07 - 15! 15 July 1955 </Td> </Tr> <Tr> <Td> United States </Td> <Td> 1964 - 10 - 15! 15 October 1964 </Td> </Tr> <Tr> <Td> Uruguay </Td> <Td> 1983 - 07 - 27! 27 July 1983 </Td> </Tr> <Tr> <Td> Venezuela </Td> <Td> 1979 - 07 - 25! 25 July 1979 </Td> </Tr> <Tr> <Td> Vietnam </Td> <Td> 2013 - 04 - 10! 10 April 2013 </Td> </Tr> <Tr> <Td> Zambia </Td> <Td> 2013 - 05 - 17! 17 May 2013 </Td> </Tr> </Table> <Tr> <Th> State </Th> <Th> Member since </Th> </Tr>

How many states are members to the hague conference on private international law
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