Year	per person
1971	13.48
1972	15.81
1973	19.53
1974	19.64
1975	23.96
1976	26.22
1977	30.97
1978	35.72
1979	47.89
1980	54.69
1981	55.2
1982	60.28
1983	60.91
1984	47.73
1985	47.28
1986	46.82
1987	46.38
1988	45.95
1989	45.55
1990	44.66
1991	43.9
1992	43.77
1993	43.46
1994	42.93
1995	42.9
1996	46.04
1997	63.39
1998	57.68
1999	59.22
2000	60.34
2001	58.03
2002	56.19
2003	55.51
2004	59.73
2005	55.8
2006	61.35
2007	69.35
2008	70.39