Year	Total
1971	314100000
1972	337100000
1973	349100000
1974	430100000
1975	535100000
1976	651100000
1977	756100000
1978	919200000
1979	1186000000
1980	1337000000
1981	1570000000
1982	1930000000
1983	2334000000
1984	2603000000
1985	2785000000
1986	2706000000
1987	2731000000
1988	3276000000
1989	3986000000
1990	4073000000
1991	4272000000
1992	4923000000
1993	5001000000
1994	5253000000
1995	5294000000
1996	5842000000
1997	6215000000
1998	6739000000
1999	7316000000
2000	7828000000
2001	8666000000
2002	9652000000
2003	10350000000
2004	12040000000
2005	12690000000
2006	14720000000
2007	15370000000
2008	16090000000