Year	per person
1971	4.156
1972	4.392
1973	4.483
1974	4.9
1975	4.876
1976	5.916
1977	6.789
1978	7.364
1979	7.931
1980	8.152
1981	7.791
1982	9.229
1983	9.644
1984	10.37
1985	11.13
1986	11.69
1987	12.65
1988	12.95
1989	14.59
1990	15.84
1991	16.39
1992	18.9
1993	21.55
1994	23.57
1995	24.33
1996	24.67
1997	27.91
1998	25.88
1999	25.01
2000	29
2001	27.58
2002	31.39
2003	35.03
2004	35.73
2005	31.14
2006	35.95
2007	32.44
2008	38.01