Year	Total
1985	12088000000
1986	12652000000
1987	13064000000
1988	13228000000
1989	13833000000
1990	14501000000
1991	15136000000
1992	15999000000
1993	16382000000
1994	17088000000
1995	17842000000
1996	19158000000
1997	19957000000
1998	21155000000
1999	22014000000
2000	23982000000
2001	24960000000
2002	25200000000
2003	25240000000
2004	25598000000
2005	25983000000
2006	27504000000
2007	28738000000
2008	30262000000
2009	28352000000
2010	28689000000
2011	27478000000
2012	27605000000
2013	26147000000
2014	26319000000
2015	28389000000
2016	30433000000