Year	Number of
1990	8934
1991	13910
1992	21110
1993	30780
1994	42720
1995	56440
1996	71650
1997	89330
1998	111600
1999	141200
2000	178700
2001	220200
2002	258600
2003	288400
2004	309100
2005	322400
2006	330600
2007	335600