Year % 1987 30.396838936005842 1988 18.950133752724017 1989 21.28074356284685 1990 21.9711391744352 1991 19.932170410335385 1992 28.5447785836521 1993 44.40762993151765 1994 44.113155823088995 1995 35.5300943196563 1996 39.77986870846045 1997 41.951599689994126 1998 30.2290511824943 1999 32.18152216645325 2000 27.948395718594586 2001 17.853097912669234 2002 17.323057908015347 2003 10.658607712595973 2004 6.022331911685126 2005 10.075668935121003 2006 -1.5593338295824728 2007 5.110629662655999 2008 3.1637200425762817 2009 15.14603742897725 2010 1.0410415284892134 2011 -3.2171781489289133 2012 3.767191392033701 2013 4.7700291412570195 2014 7.491198546846523 2015 13.308802902657817 2016 9.434724954538789 2017 1.9314209231201878 2018 4.83325951778069 2019 9.155986265684023 2020 9.625096920300958 2021 3.90645447051202 2022 2.511807602553477 2023 6.828297550797877