Year	per person
1971	11.08
1972	11.87
1973	13.74
1974	15.89
1975	17.71
1976	22.55
1977	25.72
1978	34.55
1979	29.32
1980	31.08
1981	38.47
1982	41.33
1983	42.3
1984	37.89
1985	42.02
1986	52.63
1987	50.35
1988	46.4
1989	53.26
1990	44.62
1991	44.27
1992	46.49
1993	54.44
1994	51.2
1995	49.04
1996	43.82
1997	41.93
1998	40.24
1999	39.59
2000	38.77
2001	39.37
2002	64.36
2003	62.47
2004	76.02
2005	80.02
2006	59.41
2007	74.74
2008	74.06