Year % change from 1990 1991 -7.24135981379626 1992 -29.5825329109883 1993 -27.8071770792245 1994 -25.5983479552053 1995 -20.3806487829772 1996 -20.5949622864779 1997 -14.71776446246 1998 -59.0387258577594 1999 -52.2708211895753 2000 -48.6318808836941 2001 -28.2444870139746 2002 -28.0214165422567 2003 -18.5110932815684 2004 -6.11746587744078 2005 2.15369522519744 2006 13.7226087284282 2007 8.49087350253146 2008 16.4249694078235 2009 17.9403489594621 2010 20.2196646101357 2011 20.219664610133 2012 20.2196646101371