Year	Number of
1990	7359
1991	7803
1992	7700
1993	7487
1994	7397
1995	7627
1996	8195
1997	9309
1998	10760
1999	12350
2000	13880
2001	15100
2002	15960
2003	16250
2004	15990
2005	15450
2006	14830
2007	14470