Year	Number of
1990	1934000
1991	2341000
1992	2954000
1993	3514000
1994	3514000
1995	2742000
1996	3216000
1998	3400000
1999	3386000
2000	3603000
2001	3838000
2002	3760000
2003	4346000
2004	4078000
2005	4121000
2006	4731000