Year	Total
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	7137
1969	71280
1970	79360
1971	216900
1972	408500
1973	562800
1974	621100
1975	648700
1976	649600
1977	561000
1978	657700
1979	576100
1980	445900
1981	822700
1982	754200
1983	916700
1984	1985000
1985	2411000
1986	3221000
1987	3549000
1988	4339000
1989	4826000
1990	4666000
1991	4779000
1992	4796000
1993	4820000
1994	4756000
1995	4768000
1996	4844000
1997	4755000
1998	5072000
1999	5060000
2000	5349000
2001	5478000
2002	5418000
2003	5320000
2004	5469000
2005	4947000
2006	5170000
2007	4738000
2008	5071000
2009	4537000
2010	5330000
2011	4957000