Year	Number of
1990	9602
1991	10090
1992	10600
1993	11140
1994	11720
1995	12320
1996	12950
1997	13610
1998	14300
1999	15030
2000	15790
2001	16570
2002	17400
2003	18260
2004	19160
2005	20090
2006	21070
2007	22090