Year	Number of
1990	37890
1991	36580
1992	35300
1993	34020
1994	32770
1995	31540
1996	30330
1997	29140
1998	27980
1999	26850
2000	25750
2001	24690
2002	23670
2003	22680
2004	21720
2005	20810
2006	19930
2007	19080