Year annual % change 1996 18.7000007629 1997 17.3803005219 1998 -28.5112991333 1999 33.4000015259 2000 -25.1301326752 2001 -31.6675872803 2002 -51.4000015259 2003 131.3899993896 2004 24.6200008392 2005 45.3879423329 2006 57.6475466732 2007 0.66903019213175 2008 -56.160749787 2009 97.8385758533 2010 55.31788216864448 2011 -30.2236032553253 2012 -15.8729748197112 2013 29.59 2014 12.74 2015 -10.2158387523919 2016 13.9766567267658 2017 71.6545451182719 2018 -40.6088505032763 2019 32.4930113812399 2020 123.211399175997 2021 -17.8958202866545 2022 -30.4362601899786