Year	per person
1800	1.032
1820	1.032
1913	1.306
1950	1.435
1951	1.578
1952	1.572
1953	1.479
1954	1.56
1955	1.557
1956	1.536
1957	1.532
1958	1.504
1959	1.536
1960	1.555
1961	1.494
1962	1.583
1963	1.635
1964	1.674
1965	1.683
1966	1.843
1967	1.86
1968	1.898
1969	1.876
1970	1.924
1971	1.945
1972	2.009
1973	2.006
1974	1.99
1975	2.032
1976	2.115
1977	2.111
1978	2.108
1979	2.072
1980	2.029
1981	1.949
1982	1.917
1983	1.853
1984	1.844
1985	1.787
1986	1.791
1987	1.824
1988	1.844
1989	1.852
1990	1.866
1991	1.852
1992	1.811
1993	1.773
1994	1.734
1995	1.741
1996	1.784
1997	1.731
1998	1.75
1999	1.768
2000	1.812
2001	1.881
2002	1.972
2003	2.039
2004	2.133
2005	2.232
2006	2.339
2007	2.457
2008	2.588
2009	2.676