Year % change from 1990 1991 8.11876308979318 1992 30.4669212763585 1993 136.540593815228 1994 336.121719847231 1995 731.588025131979 1996 1316.77959837305 1997 1920.45090550594 1998 2721.23937415166 1999 3891.62252063368 2000 5296.08229641239 2001 7452.05125045755 2002 9669.61931747644 2003 12170.54330417 2004 15422.9764691305 2005 19118.923247495 2006 21582.8877664047 2007 24293.2487372052 2008 27126.8079339515 2009 29837.1689047522 2010 32424.331649607 2011 32424.3316496068 2012 32424.3316496072