Year	Number of
1990	241500
1991	244400
1992	247200
1993	249800
1994	252000
1995	253700
1996	232700
1997	206900
1998	200700
1999	197200
2000	195900
2001	195100
2002	191200
2003	193700
2004	189200
2005	192900
2006	191300
2007	192100