Year	Total
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	237010
1982	1208000
1983	1422100
1984	2122900
1985	2790600
1986	3219200
1987	4497700
1988	5330900
1989	5325600
1990	5803800
1991	7192700
1992	7673600
1993	8636800
1994	9547400
1995	10108000
1996	11686000
1997	14385000
1998	15618000
1999	17108000
2000	17966000
2001	17476000
2002	18267000
2003	19104000
2004	19903000
2005	21081000
2006	21643000
2007	23133000
2008	25622000
2009	27502000
2010	32248000
2011	32901000
2012	36855000
2013	37196000
2014	37463000
2015	35412000
2016	34734000