<Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 17 </Td> <Td_colspan="1"> September 24, 2007 (2007 - 09 - 24) </Td> <Td> May 19, 2008 (2008 - 05 - 19) </Td> <Td> 8.31 </Td> <Td> 68 </Td> <Td> 3.3 / 8 </Td> <Td> 46 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> September 22, 2008 (2008 - 09 - 22) </Td> <Td> May 11, 2009 (2009 - 05 - 11) </Td> <Td> 10.03 </Td> <Td> 40 </Td> <Td> N / A </Td> <Td> N / A </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> September 21, 2009 (2009 - 09 - 21) </Td> <Td> May 24, 2010 (2010 - 05 - 24) </Td> <Td> 14.22 </Td> <Td> 12 </Td> <Td> 5.3 / 13 </Td> <Td> 5 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 23, 2010 (2010 - 09 - 23) </Td> <Td> May 19, 2011 (2011 - 05 - 19) </Td> <Td> 13.21 </Td> <Td> 13 </Td> <Td> 4.4 / 13 </Td> <Td> 7 </Td> </Tr>

The big bang theory season 4 episode 17