Year	Total
1985	26794000000
1986	28044000000
1987	29749000000
1988	29233000000
1989	29596000000
1990	28436000000
1991	29963000000
1992	31685000000
1993	32915000000
1994	33515000000
1995	34018000000
1996	35090000000
1997	35397000000
1998	37190000000
1999	37832000000
2000	35191000000
2001	36415000000
2002	36157000000
2003	34145000000
2004	33708000000
2005	35756000000
2006	35859000000
2007	39960000000
2008	40025000000
2009	35908000000
2010	37371000000
2011	36019000000
2012	34624000000
2013	30294000000
2014	29392000000
2015	30342000000
2016	31541000000