Year	per person
1800	1.175
1820	1.175
1913	1.815
1950	1.825
1951	1.856
1952	1.886
1953	1.914
1954	1.944
1955	1.973
1956	2.003
1957	2.031
1958	2.057
1959	2.085
1960	2.218
1961	2.313
1962	2.341
1963	2.396
1964	2.673
1965	2.961
1966	3.152
1967	3.24
1968	3.316
1969	3.578
1970	3.418
1971	3.578
1972	3.618
1973	3.392
1974	3.455
1975	3.355
1976	3.262
1977	3.361
1978	3.618
1979	3.744
1980	3.486
1981	3.173
1982	2.949
1983	2.693
1984	2.678
1985	2.706
1986	2.694
1987	2.636
1988	2.658
1989	2.661
1990	2.544
1991	2.442
1992	2.268
1993	1.907
1994	2.226
1995	2.25
1996	2.355
1997	2.154
1998	2.046
1999	2.046
2000	1.953
2001	1.911
2002	1.943
2003	1.99
2004	1.981
2005	1.947
2006	1.974
2007	1.963
2008	1.948
2009	1.947