Year	per person
1800	0.8793
1820	0.9089
1913	2.691
1970	35.43
1971	39.22
1972	40.96
1973	43.2
1974	45.26
1975	45.25
1976	47.77
1977	51.91
1978	54.99
1979	57.55
1980	62.25
1981	62.16
1982	58.76
1983	60.01
1984	56.17
1985	57.51
1986	60.9
1987	63.58
1988	66.52
1989	70.43
1990	61.85
1991	61.61
1992	58.43
1993	55.54
1994	58.89
1995	61.1
1996	61.99
1997	62.78
1998	67.48
1999	68.2
2000	72.82
2001	73.49
2002	72.49
2003	71.9
2004	73.48
2005	74.55
2006	77.76
2007	82
2008	82.29