Year % change from 1990 1991 4.26202957336452 1992 16.3514969908795 1993 19.3262549816593 1994 14.6948887604634 1995 23.9500518441 1996 15.973870092983 1997 21.9615933139734 1998 29.8072937379776 1999 32.9912303572137 2000 33.0392897778814 2001 36.9801622726339 2002 40.3779633138412 2003 45.6536862176395 2004 50.4007554940929 2005 54.1638081323749 2006 58.3834252670001 2007 62.4552596830721 2008 66.6965035569979 2009 72.3831345075051 2010 78.4398229971537 2011 80.2242212271252 2012 82.0086194570968