Year Total 1990 54200000 1991 59000000 1992 64500000 1993 70200000 1994 77500000 1995 86300000 1996 96600000 1997 109000000 1998 124000000 1999 141000000 2000 161000000 2001 178000000 2004 223800000 2005 230400000 2006 240500000