Year Total 1992 320000 1993 390000 1994 500000 1995 630000 1996 920000 1997 1214000 1998 1300000 1999 1400000 2000 1500000 2001 1550000 2002 1600000 2003 1666000 2004 1758000 2005 1892000 2006 2488000