Year Total 1990 6500000 1991 7500000 1992 8800000 1993 10200000 1994 12300000 1995 14600000 1996 17100000 1997 19600000 1998 22900000 1999 24400000 2000 27640000 2001 31320000 2002 35600000 2003 40000000 2004 45000000 2005 50000000 2006 54000000