Year	Number of
1990	485500
1991	497500
1992	508400
1993	518700
1994	529000
1995	539600
1996	551700
1997	565500
1998	572000
1999	592800
2000	596000
2001	598500
2002	563500
2003	541300
2004	516800
2005	457500
2006	418500
2007	364800