Year	per person
1800	0.7675
1820	0.7675
1913	3.033
1950	5.239
1951	5.277
1952	5.315
1953	5.391
1954	5.56
1955	5.604
1956	5.674
1957	5.749
1958	5.764
1959	5.946
1960	6.345
1961	6.255
1962	6.959
1963	7.462
1964	8.455
1965	8.794
1966	8.898
1967	8.32
1968	8.172
1969	8.238
1970	8.057
1971	8.039
1972	8.215
1973	8.25
1974	8.307
1975	8.087
1976	8.22
1977	8.501
1978	8.873
1979	8.982
1980	9.138
1981	9.279
1982	9.191
1983	8.677
1984	8.31
1985	8.105
1986	8.112
1987	8.1
1988	7.948
1989	8.156
1990	7.615
1991	7.826
1992	8.343
1993	7.954
1994	8.265
1995	8.384
1996	8.414
1997	8.552
1998	8.638
1999	8.75
2000	8.822
2001	8.823
2002	8.931
2003	9.144
2004	9.648
2005	9.971
2006	10.49
2007	10.87
2008	11.03
2009	10.86