Year	Number of
1990	20110
1991	20920
1992	21840
1993	22840
1994	23900
1995	25000
1996	26160
1997	27360
1998	28600
1999	29860
2000	31130
2001	32410
2002	33710
2003	35040
2004	36440
2005	37940
2006	39530
2007	41220