Year	per person
1800	1.855
1820	1.864
1913	3.197
1958	11.18
1970	29.99
1971	29.03
1972	27.86
1973	42.65
1974	104.4
1975	117.3
1976	115.4
1977	117
1978	99.97
1979	111.2
1980	127.6
1981	121
1982	103.5
1983	92.44
1984	90.96
1985	83.8
1986	64.09
1987	64.31
1988	59.32
1989	63.73
1990	71.12
1991	67.62
1992	65.97
1993	62.09
1994	63.61
1995	64.35
1996	64.22
1997	65.77
1998	62.89
1999	61.96
2000	65.82
2001	64.58
2002	63
2003	67.21
2004	70.57
2005	73.44
2006	77.52
2007	77.47
2008	76.71
2009	73.98