Year	per person
1971	59.4
1972	58.76
1973	57.93
1974	65.04
1975	72.27
1976	79.99
1977	90.44
1978	91.47
1979	97.58
1980	107
1981	115.1
1982	120.1
1983	144.8
1984	159.9
1985	176.8
1986	190.1
1987	205.1
1988	211.8
1989	223.6
1990	235.4
1991	243.3
1992	242.8
1993	250.1
1994	257.3
1995	265.8
1996	264.4
1997	271
1998	294.4
1999	316
2000	334.1
2001	357.1
2002	378.1
2003	399.2
2004	411.4
2005	437.5
2006	464
2007	501.8
2008	536.8