Year	per person
1800	1.594
1820	1.594
1920	4.541
1921	4.715
1922	4.25
1923	4.548
1924	4.746
1925	5.241
1926	4.488
1927	4.509
1928	5.71
1929	6.287
1930	5.082
1931	4.686
1932	4.217
1933	5.229
1934	4.68
1935	4.626
1936	3.583
1937	3.784
1938	3.864
1939	4.621
1940	4.93
1941	5.329
1942	5.013
1943	5.372
1944	5.201
1945	5.111
1946	5.377
1947	5.227
1948	5.568
1949	5.308
1950	5.804
1951	6.014
1952	6.825
1953	6.781
1954	7.193
1955	7.442
1956	7.212
1957	7.582
1958	7.373
1959	7.252
1960	7.123
1961	7.419
1962	7.97
1963	8.558
1964	9.26
1965	9.822
1966	9.828
1967	10.18
1968	9.999
1969	10.33
1970	10.1
1971	10.26
1972	10.28
1973	10.49
1974	11.62
1975	11.24
1976	11.45
1977	12.03
1978	10.85
1979	7.728
1980	7.738
1981	7.883
1982	7.61
1983	7.788
1984	7.451
1985	6.986
1986	6.691
1987	6.482
1988	5.615
1989	5.388
1990	5.166
1991	4.9
1992	4.759
1993	4.6
1994	4.647
1995	4.723
1996	4.818
1997	4.941
1998	5.026
1999	5.874
2000	5.462
2001	5.507
2002	5.427
2003	5.449
2004	5.614
2005	5.726
2006	5.828
2007	5.868
2008	5.896
2009	5.683