Year	per person
1971	308.9
1972	609.6
1973	810.2
1974	913.6
1975	1152
1976	1428
1977	1902
1978	2127
1979	2484
1980	2775
1981	2886
1982	3260
1983	3391
1984	3367
1985	3363
1986	3291
1987	3380
1988	3551
1989	3540
1990	3678
1991	3641
1992	3832
1993	4361
1994	4668
1995	4853
1996	5034
1997	5210
1998	5380
1999	5546
2000	5706
2001	5860
2002	6010
2003	6640
2004	6919
2005	7358
2006	8223
2007	9340
2008	11150