Year	Total
1971	580100000
1972	638100000
1973	758100000
1974	902200000
1975	1036000000
1976	1360000000
1977	1600000000
1978	2218000000
1979	1944000000
1980	2130000000
1981	2724000000
1982	3019000000
1983	3137000000
1984	2862000000
1985	3260000000
1986	4176000000
1987	4106000000
1988	3889000000
1989	4588000000
1990	3950000000
1991	4025000000
1992	4341000000
1993	5218000000
1994	5038000000
1995	4951000000
1996	4539000000
1997	4453000000
1998	4382000000
1999	4418000000
2000	4432000000
2001	4609000000
2002	7716000000
2003	7670000000
2004	9559000000
2005	10300000000
2006	7833000000
2007	10090000000
2008	10240000000