Year	per person
1800	1.094
1820	1.094
1913	1.69
1950	2.367
1951	2.459
1952	2.491
1953	2.537
1954	2.633
1955	2.667
1956	2.712
1957	2.759
1958	2.779
1959	2.882
1960	2.861
1961	2.937
1962	3.003
1963	3.055
1964	2.667
1965	2.437
1966	2.724
1967	2.817
1968	2.804
1969	2.399
1970	2.55
1971	2.556
1972	2.751
1973	2.635
1974	2.048
1975	2.691
1976	2.613
1977	3.182
1978	3.112
1979	2.645
1980	2.323
1981	2.492
1982	2.581
1983	2.275
1984	2.275
1985	2.369
1986	2.359
1987	2.397
1988	2.389
1989	2.439
1990	2.426
1991	2.26
1992	2.033
1993	2.046
1994	2.067
1995	2.089
1996	2.097
1997	2.041
1998	1.978
1999	1.956
2000	1.933
2001	1.906
2002	1.934
2003	1.964
2004	2.004
2005	2.046
2006	2.053
2007	2.06
2008	2.068