Year	per person
1971	5.754
1972	6.183
1973	6.614
1974	6.556
1975	7.474
1976	7.633
1977	8.282
1978	9.384
1979	10.18
1980	10.72
1981	11.88
1982	12.05
1983	13.42
1984	15.35
1985	11.66
1986	13.86
1987	14.97
1988	17.65
1989	20.13
1990	42.36
1991	47.25
1992	54.95
1993	62.56
1994	72.76
1995	83.48
1996	93.08
1997	101.9
1998	106.7
1999	118.2
2000	132.4
2001	144.6
2002	156.3
2003	173.7
2004	190.2
2005	216.8
2006	248.1
2007	274.8
2008	331.4