Year annual % change 1996 16.8999996185 1997 -22.0067996979 1998 -7.2550997734 1999 4.1999998093 2000 -0.5673222542 2001 -13.7124385834 2002 38.9000015259 2003 54.4399986267 2004 76.3399963379 2005 43.5180329779 2006 30.9028905489 2007 49.72087830294008 2008 -45.9255116414 2009 23.0087296919 2010 0.2059501261836738 2011 -15.0180645196905 2012 -3.22701641870823 2013 -15.6930603290126 2014 -10.4571047332061 2015 -13.1225672376962 2016 -6.57888019091982 2017 37.7820330580099 2018 -8.20235674251744 2019 -0.76208334242213 2020 -4.09667487711539 2021 43.6962622882083 2022 -18.0209414991891