Year	per person
1800	0.8495
1820	0.8495
1913	1.313
1950	4.486
1951	4.575
1952	4.661
1953	4.745
1954	4.829
1955	4.914
1956	4.995
1957	5.077
1958	5.158
1959	5.239
1960	5.3
1961	5.355
1962	5.405
1963	5.459
1964	5.512
1965	5.565
1966	5.716
1967	5.873
1968	6.029
1969	6.189
1970	6.351
1971	6.688
1972	7.046
1973	7.417
1974	7.802
1975	8.204
1976	8.015
1977	7.147
1978	6.829
1979	7.649
1980	8.703
1981	10.2
1982	10.7
1983	10.91
1984	11.27
1985	10.44
1986	9.435
1987	9.213
1988	8.949
1989	8.997
1990	8.917
1991	8.852
1992	8.808
1993	8.444
1994	7.726
1995	7.795
1996	7.888
1997	7.641
1998	7.711
1999	7.247
2000	7.508
2001	7.451
2002	7.64
2003	7.512
2004	7.577
2005	7.941
2006	8.198
2007	7.841
2008	8.045
2009	8.409