Year	per person
1971	6.406
1972	10.26
1973	11.01
1974	11.57
1975	12.63
1976	13.99
1977	15.33
1978	17.31
1979	19.41
1980	20.47
1981	21.39
1982	25.08
1983	26.16
1984	26.6
1985	30.61
1986	28.89
1987	30.62
1988	29.72
1989	29.2
1990	26.92
1991	26.32
1992	27.28
1993	27.16
1994	22.42
1995	21.4
1996	23.18
1997	24.66
1998	27.17
1999	26.87
2000	25.41
2001	24.85
2002	28.69
2003	30.46
2004	32.94
2005	30.5
2006	46.32
2007	43.97
2008	59.55