Year	Number of
1990	10980
1991	10110
1992	10030
1993	10460
1994	11510
1995	12310
1996	13250
1997	14050
1998	14940
1999	14580
2000	13890
2001	13780
2002	13550
2003	13540
2004	13750
2005	14270
2006	15090
2007	16000