Year Percent 1991 0.18072 1992 -241.14131 1993 6.9733 1994 81.57354 1995 20.79603 1996 10.45981 1997 13.56789 1998 8.11277 1999 14.08815 2000 12.89955 2001 19.56605 2002 16.26967 2003 7.80646 2004 3.49298 2005 3.82444 2006 3.25375 2007 2.9985 2008 2.46494 2009 2.59246 2010 1.63764 2011 2.1528 2012 1.84428 2013 -0.37224 2014 1.04713 2015 0.46964 2016 0.81678 2017 1.23991 2018 0.92181 2019 1.2173 2020 1.2148 2021 0.09868