Year	Total
1985	29143000000
1986	30783000000
1987	29489000000
1988	28070000000
1989	22934000000
1990	25977000000
1991	36540000000
1992	30733000000
1993	33969000000
1994	40196999999.99999
1995	36663000000
1996	53578000000
1997	44312000000
1998	41111000000.00001
1999	38915000000
2000	36049000000
2001	37726000000
2002	39283000000
2003	46178999999.99999
2004	40440000000
2005	36241000000
2006	45602000000
2007	39315000000
2008	36616000000
2009	36384000000
2010	38863000000
2011	35229000000
2012	30702000000
2013	34742000000
2014	32182000000
2015	28946000000
2016	30313000000