Year	per person
1971	165.5
1973	157
1974	147.4
1975	135.9
1976	139.6
1977	155.8
1978	151.5
1979	156.4
1980	231.3
1981	369.7
1982	378.1
1983	485.6
1984	385.2
1985	468.5
1986	442.5
1987	444.2
1988	437.1
1989	217.8
1990	249.6
1991	241.8
1992	235.4
1993	230.2
1994	368.3
1995	377.3
1996	402.1
1997	413.9
1998	423.8
1999	436.1
2000	416.1
2001	425.9
2002	438
2003	441
2004	439.5
2005	450.5
2006	474.5
2007	495
2008	537.1