Year	Total
1971	164000000
1972	186000000
1973	216000000
1974	301100000
1975	405100000
1976	495100000
1977	543100000
1978	565100000
1979	592100000
1980	595100000
1981	638100000
1982	605100000
1983	585100000
1984	545100000
1985	539100000
1986	609100000
1987	696100000
1988	719100000
1989	804100000
1990	905200000
1991	1027000000
1992	1229000000
1993	1367000000
1994	1478000000
1995	1626000000
1996	1908000000
1997	1478000000
1998	1222000000
1999	1594000000
2000	1610000000
2001	1713000000
2002	1822000000
2003	1886000000
2004	2012000000
2005	1986000000
2006	2105000000
2007	2095000000
2008	2269000000