Year	per person
1971	13.71
1972	10.03
1973	10.79
1974	10.06
1975	10.42
1976	11.37
1977	12.17
1978	13.64
1979	15.01
1980	15.07
1981	15.44
1982	14.64
1983	16.24
1984	15.9
1985	16.16
1986	15.53
1987	16.46
1988	15.7
1989	16.42
1990	17.47
1991	17.21
1992	18.42
1993	19.56
1994	20.74
1995	21.06
1996	21.66
1997	24.33
1998	33.8
1999	32.52
2000	38.46
2001	44.27
2002	47.39
2003	51.95
2004	50.33
2005	58.95
2006	53.9
2007	63.84
2008	55.79