Year	Number of
1990	29420
1991	29020
1992	33480
1993	39250
1994	46990
1995	56630
1996	65700
1997	80020
1998	93030
1999	107000
2000	122900
2001	123300
2002	129200
2003	135900
2004	142000
2005	138200
2006	124300
2007	119800