Year	Number of
1990	169500
1991	169400
1992	169300
1993	169100
1994	168800
1995	168300
1996	170500
1997	172600
1998	174500
1999	175100
2000	163500
2001	150300
2002	134200
2003	123200
2004	117200
2005	120000
2006	118600
2007	105000