Year	per person
1971	3.868
1972	4.915
1973	3.075
1974	3.932
1975	3.691
1976	5.222
1977	5.456
1978	5.883
1979	6.49
1980	5.262
1981	5.974
1982	7.598
1983	8.088
1984	9.512
1985	8.395
1986	9.445
1987	10.61
1988	10.72
1989	12.53
1990	13.77
1991	14.13
1992	13.04
1993	13.43
1994	14.37
1995	15.29
1996	16.13
1997	16.74
1998	17.74
1999	19.69
2000	21.66
2001	23.5
2002	24.24
2003	25.58
2004	28.56
2005	29.63
2006	28.5
2007	30.9
2008	31.54