Year	per person
1800	1.375
1820	1.375
1870	1.469
1902	1.584
1903	1.892
1904	1.598
1905	1.669
1906	1.701
1907	1.758
1908	1.824
1909	1.823
1910	2.058
1911	2.148
1912	2.145
1913	2.326
1914	2.24
1915	2.06
1916	2.361
1917	2.702
1918	3.026
1919	2.854
1920	3.035
1921	2.908
1922	3.195
1923	2.942
1924	3.151
1925	3.115
1926	3.21
1927	3.215
1928	3.276
1929	3.325
1930	3.252
1931	3.202
1932	3.266
1933	3.22
1934	3.174
1935	2.889
1936	3.21
1937	3.361
1938	3.39
1939	3.55
1940	3.547
1946	1.521
1947	2.06
1948	2.337
1949	2.412
1950	2.519
1951	2.708
1952	2.791
1953	2.951
1954	3.079
1955	3.195
1956	3.319
1957	3.395
1958	3.408
1959	3.533
1960	3.475
1961	3.56
1962	3.617
1963	3.755
1964	3.767
1965	3.844
1966	3.893
1967	3.978
1968	4.053
1969	4.119
1970	4.153
1971	4.255
1972	4.363
1973	4.622
1974	4.657
1975	4.786
1976	5.066
1977	5.204
1978	5.323
1979	5.469
1980	5.592
1981	5.644
1982	5.709
1983	5.686
1984	5.15
1985	4.663
1986	4.711
1987	4.802
1988	5.012
1989	5.202
1990	5.234
1991	5.088
1992	4.999
1993	4.999
1994	5.107
1995	5.227
1996	5.405
1997	5.563
1998	5.416
1999	5.489
2000	5.699
2001	5.683
2002	5.813
2003	5.981
2004	6.244
2005	6.43
2006	6.64
2007	6.971
2008	7.099
2009	7.026