Year	Total
1960	3464000000
1961	3664000000
1962	4044000000
1963	4161000000
1964	4521000000
1965	4641000000
1966	4741000000
1967	4961000000
1968	5298000000
1969	5723000000
1970	6031000000
1971	6964000000
1972	6533000000
1973	7308000000
1974	7231000000
1975	7501000000
1976	7859000000
1977	8276000000
1978	8775000000
1979	9516000000
1980	10080000000
1981	10170000000
1982	9975000000
1983	10450000000
1984	11400000000
1985	11960000000
1986	12310000000
1987	12690000000
1988	12670000000
1989	13230000000
1990	13600000000
1991	14270000000
1992	14620000000
1993	14650000000
1994	14710000000
1995	15240000000
1996	15270000000
1997	14860000000
1998	15120000000
1999	15560000000
2000	15730000000
2001	16180000000
2002	16230000000
2003	16680000000
2004	17120000000
2005	17630000000
2006	17710000000
2007	17480000000
2008	17900000000