Year	per person
1800	1.665
1820	1.665
1870	3.442
1911	6.351
1912	6.371
1913	5.908
1914	5.577
1915	5.143
1916	5.126
1917	4.911
1918	4.965
1919	5.588
1920	4.252
1921	4.765
1922	5.016
1923	5.482
1924	5.761
1925	5.871
1926	6.034
1927	6.119
1928	6.287
1929	6.244
1930	6.104
1931	5.702
1932	5.544
1933	6.302
1934	6.657
1935	7.772
1936	8.416
1937	8.371
1938	8.515
1939	8.954
1940	9.067
1941	9.398
1942	9.26
1943	9.079
1944	9.164
1945	9.537
1946	9.952
1947	9.935
1948	10.44
1949	10.45
1950	10.03
1951	10.28
1952	10.36
1953	10.59
1954	11.11
1955	11.4
1956	11.78
1957	12.03
1958	12.08
1959	12.35
1960	12.16
1961	12.24
1962	12.65
1963	13.26
1964	13.99
1965	14.53
1966	14.85
1967	15.6
1968	15.91
1969	16.32
1970	16.82
1971	17.14
1972	17.03
1973	17.42
1974	18.09
1975	17.99
1976	18.01
1977	17.61
1978	17.76
1979	18.04
1980	18.81
1981	19.36
1982	18.79
1983	17.96
1984	18.4
1985	17.69
1986	17.24
1987	17.16
1988	17.47
1989	17.49
1990	17.08
1991	16.55
1992	15.84
1993	15.7
1994	15.87
1995	16.02
1996	16.35
1997	16.4
1998	16.1
1999	16.08
2000	16.35
2001	16.49
2002	16.91
2003	17.25
2004	17.88
2005	18.59
2006	19.42
2007	20.29
2008	20.68
2009	20.05