Year	per person
1800	0.9963
1820	0.9963
1913	1.091
1950	1.131
1951	1.162
1952	1.191
1953	1.222
1954	1.253
1955	1.286
1956	1.32
1957	1.353
1958	1.39
1959	1.425
1960	1.451
1961	1.502
1962	1.584
1963	1.554
1964	1.578
1965	1.625
1966	1.618
1967	1.743
1968	1.778
1969	1.793
1970	1.776
1971	1.824
1972	1.874
1973	1.751
1974	1.694
1975	1.596
1976	1.556
1977	1.63
1978	1.78
1979	1.756
1980	1.743
1981	1.776
1982	1.77
1983	1.706
1984	1.69
1985	1.861
1986	2.095
1987	2
1988	2.101
1989	2.012
1990	1.93
1991	2.057
1992	2.043
1993	1.965
1994	1.928
1995	1.952
1996	2.038
1997	2.075
1998	2.146
1999	2.214
2000	2.196
2001	2.259
2002	2.276
2003	2.37
2004	2.405
2005	2.5
2006	2.578
2007	2.609
2008	2.683
2009	2.707