Year	per person
1971	1.893
1972	1.852
1973	1.877
1974	2.397
1975	2.033
1976	1.733
1977	1.828
1978	2.533
1979	2.667
1980	2.589
1981	3.276
1982	3.858
1983	4.855
1984	5.574
1985	6.587
1986	7.302
1987	8.212
1988	8.737
1989	10.18
1990	11.13
1991	12.8
1992	17.23
1993	20.03
1994	21.61
1995	23.53
1996	29.22
1997	29.99
1998	31.58
1999	34.73
2000	42.2
2001	46.53
2002	49.94
2003	52.43
2004	56.68
2005	59.11
2006	63.21
2007	62.56
2008	68.12