Year	per person
1800	0.8641
1820	0.8641
1913	1.335
1950	1.459
1951	1.599
1952	1.712
1953	1.774
1954	1.845
1955	1.879
1956	1.966
1957	1.987
1958	1.889
1959	1.914
1960	1.915
1961	1.671
1962	1.966
1963	2.007
1964	1.914
1965	1.89
1966	1.967
1967	1.889
1968	1.911
1969	2.029
1970	1.968
1971	2.037
1972	1.984
1973	2.096
1974	2.11
1975	1.948
1976	1.786
1977	1.745
1978	1.596
1979	1.544
1980	1.532
1981	1.526
1982	1.478
1983	1.46
1984	1.499
1985	1.46
1986	1.483
1987	1.475
1988	1.437
1989	1.383
1990	1.306
1991	1.157
1992	1.02
1993	0.8676
1994	0.8189
1995	0.8053
1996	0.7943
1997	0.7533
1998	0.7365
1999	0.6945
2000	0.6413
2001	0.6182
2002	0.6302
2003	0.6568
2004	0.6897
2005	0.7237
2006	0.7419
2007	0.7653
2008	0.7881
2009	0.7868