Year	per person
1800	0.8787
1820	0.8787
1913	1.358
1950	2.473
1951	2.53
1952	2.585
1953	2.639
1954	2.696
1955	2.753
1956	2.811
1957	2.87
1958	2.929
1959	2.986
1960	2.958
1961	2.946
1962	3.048
1963	2.95
1964	2.819
1965	2.773
1966	2.665
1967	2.625
1968	2.557
1969	2.673
1970	2.666
1971	2.657
1972	2.421
1973	2.251
1974	2.501
1975	2.863
1976	2.754
1977	2.487
1978	2.414
1979	1.877
1980	1.765
1981	1.743
1982	1.75
1983	1.945
1984	1.966
1985	2.376
1986	2.216
1987	2.089
1988	2.338
1989	2.407
1990	2.191
1991	2.338
1992	2.32
1993	2.201
1994	2.244
1995	2.184
1996	2.182
1997	2.204
1998	2.3
1999	2.279
2000	2.23
2001	2.378
2002	2.535
2003	2.823
2004	3.661
2005	3.836
2006	3.748
2007	3.663
2008	3.558
2009	3.416