Year	Number of
1990	5646
1991	9328
1992	13630
1993	18470
1994	23210
1995	27730
1996	31550
1997	35610
1998	39720
1999	44070
2000	48840
2001	53530
2002	57830
2003	60920
2004	62190
2005	62160
2006	61420
2007	61090