Year	Number of
1990	11370
1991	18030
1992	20360
1993	23010
1994	24650
1995	26640
1996	27150
1997	28570
1998	30150
1999	30980
2000	33650
2001	36860
2002	40990
2003	43560
2004	43890
2005	43730
2006	42870
2007	41860