Year	Total
1985	4528000000
1986	4800000000
1987	5587000000
1988	6541000000
1989	7115000000
1990	7732000000
1991	8270000000
1992	8894000000
1993	9206000000
1994	9784000000
1995	10806000000
1996	11474000000
1997	11858000000
1998	12882000000
1999	14450000000
2000	15771000000
2001	17392000000
2002	18665000000
2003	19712000000
2004	24683000000
2005	26447000000
2006	29531000000
2007	31005000000
2008	34218000000
2009	37177000000
2010	40790000000
2011	44153000000
2012	48562000000
2013	53120000000
2014	55845000000
2015	60762000000
2016	67387000000