Year	per person
1800	0.8142
1820	0.8142
1913	1.258
1950	1.606
1951	1.639
1952	1.671
1953	1.702
1954	1.735
1955	1.768
1956	1.8
1957	1.832
1958	1.865
1959	1.898
1960	1.98
1961	2.021
1962	2.188
1963	2.354
1964	2.311
1965	2.433
1966	2.352
1967	2.312
1968	2.281
1969	2.165
1970	2.183
1971	2.257
1972	2.093
1973	1.698
1974	1.804
1975	1.715
1976	1.686
1977	1.774
1978	1.964
1979	2.053
1980	2.1
1981	2.072
1982	1.995
1983	1.909
1984	1.545
1985	1.532
1986	1.561
1987	1.466
1988	1.507
1989	1.47
1990	1.405
1991	1.401
1992	1.275
1993	1.257
1994	1.27
1995	1.266
1996	1.273
1997	1.273
1998	1.367
1999	1.321
2000	1.266
2001	1.317
2002	1.318
2003	1.338
2004	1.289
2005	1.344
2006	1.38
2007	1.384
2008	1.467
2009	1.411