Year % change from 1990 1991 -15.8183056124699 1992 23.9700985999193 1993 -19.7609498720091 1994 -10.5180791424854 1995 -8.38165644414749 1996 -18.895381433603 1997 -21.5133052287853 1998 80.2369585763536 1999 45.6193587434794 2000 44.8042309495251 2001 28.8960778776512 2002 37.4275645768605 2003 54.563581974883 2004 41.9028434788421 2005 66.9188415927156 2006 36.9542036200199 2007 36.1035063054067 2008 40.1498243443969 2009 28.2728871798619 2010 36.0106585748593 2011 36.0106585748593 2012 36.0106585748593