Year	per person
1971	7.867
1972	8.164
1973	8.523
1974	8.98
1975	9.657
1976	10.41
1977	11.43
1978	13.38
1979	16.12
1980	15.68
1981	18.68
1982	22
1983	26.15
1984	28.12
1985	30.05
1986	33.03
1987	36.66
1988	40.95
1989	40.6
1990	48.14
1991	55.17
1992	61.34
1993	68.11
1994	76.66
1995	93.06
1996	99.26
1997	114
1998	123.4
1999	131.9
2000	148.2
2001	159.8
2002	161.1
2003	166.7
2004	186.7
2005	188.5
2006	198
2007	211.7
2008	222