Year Total 1985 5069000000 1986 5683000000 1987 6213000000 1988 6955000000 1989 7948000000 1990 8681000000 1991 9210000000 1992 9705000000 1993 10662000000 1994 12288000000 1995 14665000000 1996 16962000000 1997 19253000000 1998 21694000000 1999 23599000000 2000 26683000000 2001 30673000000 2002 35888000000.00001 2003 40546000000 2004 46202000000 2005 52078000000 2006 57917000000 2007 64146999999.99999 2008 70960000000 2009 80643000000 2010 91722000000.00002 2011 101500000000 2012 115150000000 2013 124450000000 2014 142250000000 2015 159680000000 2016 175700000000