Year	Number of
1990	30580
1991	30090
1992	29570
1993	29040
1994	28490
1995	27940
1996	27680
1997	27410
1998	27160
1999	25210
2000	21200
2001	26420
2002	25610
2003	25410
2004	24530
2005	23750
2006	20020
2007	19830