Year	per person
1971	21.45
1972	17.44
1973	18.73
1974	18.89
1975	19.77
1976	21.17
1977	21.89
1978	24.43
1979	28.27
1980	32.02
1981	34.72
1982	39.79
1983	41.24
1984	47.32
1985	50.13
1986	50.88
1987	53.66
1988	33.05
1989	30.94
1990	38.28
1991	39.17
1992	40.04
1993	46.35
1994	45.98
1995	71.14
1996	69.44
1997	79.43
1998	88.02
1999	96.43
2000	107.1
2001	109.8
2002	110.2
2003	121.4
2004	130.6
2005	142.9
2006	151.5
2007	156.4
2008	161.1