Year	Number of
1980	220
1981	286
1982	127
1983	1977
1984	1430
1985	1486
1986	1285
1987	1086
1988	2977
1989	2572
1990	2591
1991	2912
1992	2684
1993	2871
1994	3303
1995	3186
1996	1936
1997	2180
1998	2784
1999	4710
2002	5077
2003	4679
2004	4946
2005	6311
2007	5879