Year	per person
1971	15.22
1972	15.94
1973	16.11
1974	16.38
1975	17.42
1976	16.85
1977	17.11
1978	17.91
1979	28.69
1980	28.05
1981	29.26
1982	28.99
1983	29.32
1984	30.03
1985	30.26
1986	29.01
1987	35.43
1988	33.54
1989	32.21
1990	33.4
1991	34.12
1992	35.06
1993	35.92
1994	36.97
1995	30.01
1996	30.62
1997	32.1
1998	33.21
1999	30.16
2000	26.68
2001	29.33
2002	31.26
2003	32.65
2004	33.96
2005	35.27
2006	38.44
2007	41.99
2008	41.18