Year	per person
1800	1.764
1820	1.764
1920	4.022
1921	3.965
1922	4.098
1923	4.202
1924	4.388
1925	3.992
1926	4.612
1927	3.994
1928	4.549
1929	4.491
1930	4.508
1931	3.985
1932	3.551
1933	3.978
1934	4.053
1935	4.404
1936	4.249
1937	4.594
1938	4.216
1939	4.466
1940	4.792
1941	4.632
1942	4.942
1943	5.327
1944	4.965
1945	4.705
1946	4.725
1947	5.876
1948	7.364
1949	6.578
1950	6.422
1951	6.384
1952	6.685
1953	6.97
1954	6.856
1955	7.007
1956	7.339
1957	7.503
1958	7.439
1959	7.539
1960	7.607
1961	7.629
1962	8.282
1963	8.371
1964	8.877
1965	9.062
1966	9.368
1967	9.558
1968	9.531
1969	9.515
1970	9.433
1971	9.585
1972	9.913
1973	10.1
1974	10.51
1975	10.8
1976	10.92
1977	11.27
1978	11.71
1979	11.24
1980	10.15
1981	9.428
1982	8.988
1983	8.955
1984	9.021
1985	9.08
1986	9.012
1987	9.08
1988	9.085
1989	9.022
1990	9.139
1991	9.24
1992	9.746
1993	10.19
1994	10.61
1995	11.06
1996	11.05
1997	11.3
1998	11.51
1999	11.68
2000	11.71
2001	11.69
2002	11.74
2003	11.73
2004	11.73
2005	11.85
2006	12.26
2007	12.71
2008	12.93
2009	12.38