Year	Total
1971	795100000
1972	1024000000
1973	1496000000
1974	1284000000
1975	1490000000
1976	1726000000
1977	2006000000
1978	2427000000
1979	2738000000
1980	3006000000
1981	3169000000
1982	3632000000
1983	4189000000
1984	4733000000
1985	5166000000
1986	5796000000
1987	6137000000
1988	6255000000
1989	7026000000
1990	8089000000
1991	9154000000
1992	10260000000
1993	11940000000
1994	12900000000
1995	14620000000
1996	16050000000
1997	17670000000
1998	18870000000
1999	18250000000
2000	19480000000
2001	21070000000
2002	22120000000
2003	23500000000
2004	24740000000
2005	25620000000
2006	27010000000
2007	28050000000
2008	28790000000