Year Percent Change 1993-01-01 20.992680467820600 1994-01-01 16.030766316365800 1995-01-01 12.540189874900900 1996-01-01 13.833138986462900 1997-01-01 10.723474212078000 1998-01-01 6.863660902226940 1999-01-01 2.415745538273250 2000-01-01 2.220264300976470 2001-01-01 6.219137462275070 2002-01-01 5.932892745285360 2003-01-01 4.656502259555130 2004-01-01 0.984311039064359 2005-01-01 -0.615293034917942 2006-01-01 0.107660935238796 2007-01-01 2.905785754937780 2008-01-01 4.495641629104270 2009-01-01 2.885052918719560 2010-01-01 0.835862348697167