Year	per person
1800	1.191
1820	1.191
1913	2.197
1950	3.796
1960	4.097
1961	4.152
1962	4.202
1963	4.257
1964	4.325
1965	4.406
1966	4.495
1967	4.603
1968	4.838
1969	4.99
1970	5.143
1971	5.27
1972	5.738
1973	5.975
1974	6.691
1975	6.81
1976	6.666
1977	6.927
1978	7.278
1979	7.614
1980	8.539
1981	8.424
1982	8.184
1983	7.852
1984	7.759
1985	7.643
1986	7.795
1987	8.432
1988	8.975
1989	9.962
1990	10.68
1991	11.62
1992	12.68
1993	13.07
1994	12.73
1995	12.45
1996	12.35
1997	12.35
1998	12.35
1999	13.14
2000	14.35
2001	14.63
2002	14.91
2003	15.8
2004	16.01
2005	15.99
2006	16.21
2007	15.9
2008	16
2009	15.35