Year	per person
1971	7.477
1972	12.06
1973	24.52
1974	47.5
1975	77.76
1976	128.6
1977	187.2
1978	205
1979	249.3
1980	322.7
1981	391
1982	468.2
1983	548.1
1984	654.1
1985	779
1986	956.1
1987	983.9
1988	1057
1989	1062
1990	1175
1991	1188
1992	1305
1993	1444
1994	1497
1995	1467
1996	1380
1997	1422
1998	1554
1999	1547
2000	1566
2001	1612
2002	1627
2003	1651
2004	1709
2005	1586
2006	1866
2007	1921
2008	2125