Year	per person
1971	18.09
1972	19.89
1973	22.39
1974	30.39
1975	40.03
1976	47.91
1977	51.54
1978	52.71
1979	54.43
1980	54.02
1981	57.09
1982	53.08
1983	48.15
1984	42.49
1985	40.76
1986	44.21
1987	49.13
1988	49.36
1989	53.7
1990	58.78
1991	64.86
1992	75.51
1993	81.46
1994	85.58
1995	92.04
1996	105.8
1997	80.26
1998	64.94
1999	82.89
2000	81.92
2001	85.27
2002	88.67
2003	89.74
2004	93.67
2005	90.51
2006	93.95
2007	91.61
2008	97.25