Year	per person
1800	0.8245
1820	0.8245
1913	0.9834
1950	1.055
1951	1.101
1952	1.119
1953	1.143
1954	1.192
1955	1.213
1956	1.24
1957	1.264
1958	1.28
1959	1.331
1960	1.363
1961	1.427
1962	1.505
1963	1.398
1964	1.462
1965	1.533
1966	1.536
1967	1.554
1968	1.571
1969	1.586
1970	1.609
1971	1.626
1972	1.626
1973	1.664
1974	1.745
1975	1.781
1976	1.916
1977	1.918
1978	1.928
1979	1.892
1980	1.916
1981	1.886
1982	1.88
1983	1.861
1984	1.827
1985	1.771
1986	1.757
1987	1.767
1988	1.824
1989	1.85
1990	1.83
1991	1.749
1992	1.742
1993	1.775
1994	1.788
1995	1.81
1996	1.839
1997	1.907
1998	1.968
1999	1.995
2000	1.988
2001	2.05
2002	2.074
2003	2.049
2004	2.056
2005	2.075
2006	2.059
2007	2.03
2008	2.063
2009	1.993