Year	per person
1971	20.81
1972	26.08
1973	37.13
1974	31.09
1975	35.25
1976	39.94
1977	45.45
1978	53.87
1979	59.53
1980	63.91
1981	66.1
1982	74.38
1983	84.29
1984	93.66
1985	100.6
1986	111.2
1987	116
1988	116.5
1989	129.1
1990	146.6
1991	163.7
1992	181.1
1993	207.9
1994	221.9
1995	248.5
1996	269.5
1997	293.4
1998	310.1
1999	297.2
2000	314.8
2001	338.1
2002	352.1
2003	371.5
2004	388.2
2005	399.1
2006	417.9
2007	431
2008	439.6