Year	per person
1800	1.68
1820	1.68
1870	2.791
1913	4.541
1950	5.327
1951	5.258
1952	5.371
1953	5.343
1954	5.609
1955	5.641
1956	6.062
1957	6.61
1958	6.71
1959	7.782
1960	8.151
1961	7.024
1962	5.594
1963	6.9
1964	7.049
1965	7.298
1966	6.734
1967	7.121
1968	7.719
1969	8.219
1970	8.78
1971	7.806
1972	9.173
1973	9.199
1974	9.476
1975	9.844
1976	10.18
1977	10.77
1978	11.78
1979	12.46
1980	12.3
1981	12.22
1982	12.6
1983	12.84
1984	13.13
1985	13.39
1986	12.89
1987	12.46
1988	11.88
1989	11.97
1990	11.5
1991	11.1
1992	11.02
1993	10.53
1994	10.2
1995	10.38
1996	10.58
1997	10.52
1998	10.89
1999	11.07
2000	11.18
2001	11.31
2002	11.6
2003	12.23
2004	12.7
2005	13.18
2006	13.09
2007	13.25
2008	13.54
2009	13.61