Year % change from 1990 1991 -2.5018701835001 1992 2.45371629005346 1993 3.7499622409507 1994 6.40357938018299 1995 9.89642470667882 1996 12.6314237027323 1997 15.4341224530411 1998 18.1207898660043 1999 27.074393323134 2000 25.7603784078652 2001 28.0717652933034 2002 27.0704841509722 2003 24.2095031975251 2004 31.4306326284385 2005 36.1406520143786 2006 37.2302449096359 2007 50.4386268855092 2008 62.2525005375112 2009 65.1845573484441 2010 72.9451525376746 2011 74.6746040630514 2012 76.4040555884281