Year % change from 1990 1991 -0.00132831686798784 1992 1.51895993562707 1993 1.73634613383551 1994 3.62577072370049 1995 7.73993822466275 1996 9.71036567655732 1997 10.5802174897485 1998 1.91616219565047 1999 9.17288747263494 2000 7.34891820232619 2001 12.6689953700383 2002 13.5048523738783 2003 15.5661333846707 2004 16.3111265692923 2005 19.2499443732782 2006 22.5875492621661 2007 27.1030776099477 2008 29.9907642909531 2009 34.1165261829929 2010 40.0963674568397 2011 42.4593661237747 2012 44.6709619559371