Year	per person
1800	2.38
1820	2.38
1939	5.001
1940	5.214
1941	5.086
1942	5.229
1943	5.745
1944	5.668
1945	5.55
1946	6.054
1947	6.536
1948	7.23
1949	7.155
1950	7.163
1951	7.056
1952	7.724
1953	7.683
1954	8.087
1955	8.079
1956	8.153
1957	8.291
1958	8.3
1959	8.503
1960	8.799
1961	8.762
1962	8.961
1963	8.921
1964	9.27
1965	9.865
1966	9.826
1967	10.04
1968	10.29
1969	10.53
1970	10.94
1971	11.23
1972	11.58
1973	12.65
1974	13.01
1975	13.3
1976	14.18
1977	14.65
1978	15.23
1979	15.61
1980	15.88
1981	16.08
1982	15.82
1983	15.08
1984	15.28
1985	15.52
1986	15.56
1987	14.21
1988	15.33
1989	14.97
1990	15.01
1991	15.44
1992	15.58
1993	15.59
1994	15.94
1995	16.09
1996	16.08
1997	16.29
1998	16.05
1999	14.63
2000	12.32
2001	12.75
2002	12.66
2003	12.96
2004	13.84
2005	14.33
2006	14.65
2007	14.74
2008	15.59
2009	15.43