<Tr> <Th> Mean monthly sunshine hours </Th> <Td> 158 </Td> <Td> 173 </Td> <Td> 221 </Td> <Td> 238 </Td> <Td> 280 </Td> <Td> 316 </Td> <Td> 364 </Td> <Td> 335 </Td> <Td> 250 </Td> <Td> 203 </Td> <Td> 161 </Td> <Td> 135 </Td> <Td> 2,840 </Td> </Tr> <Tr> <Td_colspan="14"> Source: Agencia Estatal de Meteorología </Td> </Tr> <P> Madrid derives almost 73.5 percent of its water supply from dams and reservoirs built on the Lozoya River, such as the El Atazar Dam, which was built in 1972 and inaugurated by Francisco Franco . This water supply is managed by Canal de Isabel II, a public entity created in 1851 . It is responsible for the supply, depurating waste water and the conservation of all the Comunidad de Madrid region natural water resources . </P> <Table> <Tr> <Th_colspan="3"> Historical population </Th> </Tr> <Tr> <Th> Year </Th> <Th> Pop . </Th> <Th> ±% </Th> </Tr> <Tr> <Th> 1897 </Th> <Td> 510,616 </Td> <Td>--</Td> </Tr> <Tr> <Th> 1900 </Th> <Td> 540,109 </Td> <Td> + 5.8% </Td> </Tr> <Tr> <Th> 1910 </Th> <Td> 556,958 </Td> <Td> + 3.1% </Td> </Tr> <Tr> <Th> 1920 </Th> <Td> 728,937 </Td> <Td> + 30.9% </Td> </Tr> <Tr> <Th> 1930 </Th> <Td> 863,958 </Td> <Td> + 18.5% </Td> </Tr> <Tr> <Th> 1940 </Th> <Td> 1,096,466 </Td> <Td> + 26.9% </Td> </Tr> <Tr> <Th> 1950 </Th> <Td> 1,527,894 </Td> <Td> + 39.3% </Td> </Tr> <Tr> <Th> 1960 </Th> <Td> 2,177,123 </Td> <Td> + 42.5% </Td> </Tr> <Tr> <Th> 1970 </Th> <Td> 3,120,941 </Td> <Td> + 43.4% </Td> </Tr> <Tr> <Th> 1980 </Th> <Td> 3,158,818 </Td> <Td> + 1.2% </Td> </Tr> <Tr> <Th> 1991 </Th> <Td> 2,909,792 </Td> <Td> − 7.9% </Td> </Tr> <Tr> <Th> 2001 </Th> <Td> 2,938,723 </Td> <Td> + 1.0% </Td> </Tr> <Tr> <Th> 2011 </Th> <Td> 3,198,645 </Td> <Td> + 8.8% </Td> </Tr> <Tr> <Th> 2014 </Th> <Td> 3,165,235 </Td> <Td> − 1.0% </Td> </Tr> <Tr> <Th> 2015 </Th> <Td> 3,141,991 </Td> <Td> − 0.7% </Td> </Tr> <Tr> <Td_colspan="3"> Source: Alterations to the municipalities in the Population Censuses since 1842, Instituto Nacional de Estadistica </Td> </Tr> </Table>

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