Year 2015 = 100 1980 39.2791530761 1981 36.4472278389 1982 33.106726365 1983 33.4303713725 1984 26.9736757133 1985 22.7822441077 1986 19.7597935867 1987 22.0984998536 2000 53.5110374956 2001 20.8124659966 2002 16.1919954996 2003 15.3684949973 2004 29.8339793948 2005 28.7823837073 2006 39.3529864712 2007 37.4267012912 2008 48.9724596322 2009 30.0451694587 2010 34.5415860506 2011 47.6596106504 2012 44.2059901609 2013 63.8962599496 2014 112.0454990332 2015 100 2016 82.5620802215 2017 68.1057327372 2018 69.7453274075 2019 67.2271956406 2020 73.8720448406 2021 80.9250182821