Year	per person
1800	1.923
1820	1.923
1913	2.599
1970	58.88
1971	56.76
1972	62.49
1973	74.59
1974	106.9
1975	111.7
1976	81.43
1977	77.6
1978	78.38
1979	70.81
1980	38.03
1981	33.57
1982	34
1983	32.81
1984	32.75
1985	29.05
1986	28.33
1987	27.52
1988	32.76
1989	33.49
1990	35.08
1991	32.95
1992	30.05
1993	25.64
1994	26.75
1995	28.85
1996	30.98
1997	30.83
1998	30.65
1999	28.34
2000	27.9
2001	27.87
2002	26.61
2003	26.07
2004	27.19
2005	28.54
2006	29.25
2007	30.79
2008	31.29