Year	per person
1800	1.774
1820	1.782
1913	3.058
1934	3.455
1950	20.08
1951	20.85
1952	21.64
1953	22.44
1954	23.24
1955	24.03
1956	24.8
1957	25.52
1958	26.14
1959	26.69
1960	27.14
1961	27.51
1962	27.97
1963	28.57
1964	29.33
1965	30.29
1966	31.33
1967	32.47
1968	33.6
1969	34.79
1970	36.15
1971	38.01
1972	40.06
1973	41.76
1974	43.65
1975	37.43
1976	41.16
1977	42.41
1978	42.13
1979	40.29
1980	41.88
1981	41.16
1982	42.13
1983	43.34
1984	43.49
1985	41.74
1986	41.19
1987	40.62
1988	40.73
1989	40.42
1990	39.17
1991	39.8
1992	41.74
1993	44
1994	42.76
1995	43.33
1996	44.08
1997	44.5
1998	45.69
1999	46.75
2000	48.28
2001	49.63
2002	51.32
2003	54.14
2004	56.27
2005	59.73
2006	62.45
2007	66.17
2008	68.84
2009	53.13