Year	per person
1800	1.497
1820	1.497
1920	3.327
1921	3.614
1922	3.376
1923	3.674
1924	3.932
1925	3.818
1926	3.817
1927	4.025
1928	4.072
1929	4.498
1930	4.643
1931	4.237
1932	3.609
1933	3.55
1934	3.953
1935	4.477
1936	6.028
1937	5.769
1938	5.815
1939	6.424
1940	7.17
1941	7.386
1942	7.32
1943	4.797
1944	4.553
1945	4.529
1946	5.236
1947	5.164
1948	5.198
1949	5.519
1950	5.451
1951	5.37
1952	5.325
1953	5.362
1954	5.305
1955	5.28
1956	5.594
1957	5.739
1958	5.833
1959	5.944
1960	5.914
1961	5.994
1962	6.032
1963	6.422
1964	6.532
1965	6.7
1966	6.95
1967	7.111
1968	7.601
1969	7.82
1970	8.115
1971	8.401
1972	8.841
1973	9.252
1974	9.644
1975	9.632
1976	10.13
1977	10.7
1978	11.01
1979	11.29
1980	11.48
1981	11.29
1982	10.57
1983	10.06
1984	9.842
1985	9.512
1986	9.257
1987	9.312
1988	9.397
1989	9.484
1990	9.493
1991	9.558
1992	9.736
1993	9.831
1994	9.938
1995	10.14
1996	10.15
1997	10.27
1998	10.5
1999	10.62
2000	10.71
2001	10.68
2002	10.65
2003	10.62
2004	10.65
2005	10.74
2006	11.04
2007	11.45
2008	11.54
2009	11.32