Year	per person
1800	0.9677
1820	0.9723
1913	1.668
1950	12.79
1951	13.62
1952	14.17
1953	15.28
1954	16.7
1955	16.76
1956	17.64
1957	17.89
1958	18.38
1959	19.83
1960	21.33
1961	23.32
1962	25.5
1963	27.05
1964	28.7
1965	31.37
1966	35
1967	37.07
1968	39.28
1969	41.12
1970	43.73
1971	48.61
1972	54.47
1973	63.32
1974	70.73
1975	67.61
1976	69.43
1977	74.93
1978	74.1
1979	73.66
1980	75.81
1981	76.98
1982	73.89
1983	62.31
1984	58.81
1985	51.89
1986	46.41
1987	46.49
1988	46.04
1989	45.91
1990	51.58
1991	55.07
1992	54.48
1993	50.82
1994	48.27
1995	46.41
1996	45.55
1997	45.15
1998	44.64
1999	43.06
2000	43.86
2001	42.83
2002	41.7
2003	43.74
2004	44.92
2005	46.54
2006	46.83
2007	46.61
2008	47.45
2009	46.36