Year	Number of
1990	26900
1991	42110
1992	45690
1993	43890
1994	156100
1995	214500
1996	181200
1997	189600
1998	168100
1999	253500
2000	259100
2001	243900
2002	224600
2003	318100
2004	224800
2005	223500
2006	188000