Year	per person
1800	1.25
1820	1.25
1950	4.571
1951	4.979
1952	5.236
1953	5.209
1954	5.074
1955	6.239
1956	7.425
1957	7.562
1958	8.126
1959	8.557
1960	10.75
1961	11.49
1962	14.82
1963	19.43
1964	26.67
1965	33.18
1966	38.04
1967	41.17
1968	53.32
1969	57.99
1970	59.02
1971	53.96
1972	46.08
1973	44.43
1974	36.21
1975	37.49
1976	44.89
1977	48.14
1978	48.93
1979	53.46
1980	51.89
1981	40.7
1982	38.08
1983	36.5
1984	32.62
1985	29.61
1986	27.12
1987	25.81
1988	25.48
1989	25.17
1990	24.28
1991	22.43
1992	21.14
1993	19.86
1994	19.32
1995	19.16
1996	19.85
1997	20.76
1998	19.73
1999	19.66
2000	20.04
2001	20.92
2002	20.91
2003	21.83
2004	22.6
2005	23.69
2006	24.79
2007	26.13
2008	26.49
2009	26.43