Year	per person
1800	1.733
1820	1.733
1870	1.924
1913	3.604
1950	6.25
1951	6.468
1952	6.698
1953	6.93
1954	7.173
1955	7.426
1956	7.69
1957	7.959
1958	8.238
1959	8.527
1960	8.829
1961	9.139
1962	10.29
1963	11.5
1964	12.19
1965	13.59
1966	13.71
1967	13.59
1968	13.75
1969	15.06
1970	16.05
1971	16.82
1972	18.24
1973	20.02
1974	19.98
1975	19.7
1976	22.27
1977	24.53
1978	26.14
1979	27.6
1980	29.59
1981	31.56
1982	31.93
1983	33.24
1984	36.19
1985	35.96
1986	39.33
1987	43.94
1988	47.1
1989	48.02
1990	49.42
1991	51.63
1992	54.29
1993	56.72
1994	58.52
1995	59.25
1996	60.19
1997	62.23
1998	58.7
1999	60.2
2000	65.73
2001	65.5
2002	66.25
2003	67.9
2004	73.25
2005	78.25
2006	82.87
2007	87.61
2008	88.77
2009	85.72