Year	Total
1971	274000000
1972	227000000
1973	248000000
1974	254000000
1975	270000000
1976	294100000
1977	309100000
1978	351100000
1979	414100000
1980	477100000
1981	526100000
1982	613100000
1983	644100000
1984	748100000
1985	803100000
1986	827100000
1987	885200000
1988	553100000
1989	525100000
1990	658100000
1991	681100000
1992	704100000
1993	826100000
1994	831100000
1995	1302000000
1996	1285000000
1997	1485000000
1998	1662000000
1999	1838000000
2000	2061000000
2001	2130000000
2002	2157000000
2003	2396000000
2004	2599000000
2005	2867000000
2006	3064000000
2007	3188000000
2008	3308000000