Year	Number of
1990	7509000
1991	6948000
1992	9327000
1993	9868000
1994	8562000
1995	6347000
1996	4595000
1997	4065000
1998	5062000
1999	4215000
2000	4333000
2001	4223000
2002	3516000
2003	3731000
2004	2600000
2005	2853000
2006	2234000