Year	per person
1971	9.41
1972	9.161
1973	8.93
1974	10.15
1975	11.41
1976	12.34
1977	14.44
1978	16.19
1979	20.71
1980	27.66
1981	30.5
1982	35.24
1983	39.86
1984	47.01
1985	51.25
1986	57.29
1987	64.72
1988	72.9
1989	77.88
1990	81.71
1991	88.49
1992	109.7
1993	115
1994	124.2
1995	133.1
1996	134.4
1997	138.3
1998	139.5
1999	150.6
2000	155.6
2001	154.4
2002	154
2003	165.6
2004	173.4
2005	189.2
2006	201.1
2007	199.1
2008	186.9