Year	Number of
1980	839
1981	933
1982	187
1983	532
1984	1872
1985	1621
1986	1851
1987	2534
1988	2578
1989	1626
1990	2933
1991	2631
1992	3113
1993	3204
1994	3075
1995	3087
1996	3655
1997	5022
1998	4142
1999	4466
2000	4216
2002	4457
2003	4496
2004	4525
2005	4697
2006	4989
2007	5166