Year	Number of
1980	645
1981	465
1982	205
1983	376
1984	368
1985	530
1986	1310
1987	752
1988	778
1989	1362
1990	1163
1991	1246
1992	1059
1993	1558
1994	1647
1995	1613
1996	1678
1997	1445
1998	846
1999	1164
2000	1273
2002	1566
2003	1647
2004	1835
2005	1774
2006	2137