Year % change from 1990 1991 -0.268128030814163 1992 -0.00635952924067373 1993 0.24930639376759 1994 1.50740114304475 1995 3.15606092043552 1996 4.36918930134402 1997 6.57414729312062 1998 -83.4041981886263 1999 -79.7067749542466 2000 -75.3712776679672 2001 -72.6476004982276 2002 -69.1337999985871 2003 -65.5120702580236 2004 -61.7023236049667 2005 -57.7939091769293 2006 -53.3281215171143 2007 -49.3357892464859 2008 -45.1794090648346 2009 -44.5649447973592 2010 -43.8883960432167 2011 -43.8883960432164 2012 -43.8883960432161