Year % 2007 108.967854119677 2008 97.5833868527563 2009 105.453386055646 2010 92.8933912565759 2011 92.2166859605237 2012 100.867008887754 2013 86.7027103837724 2014 104.374059827962 2015 101.681203409829 2016 93.094518547001 2017 101.288482566659 2018 88.0923248263024 2019 92.1624608598879 2020 91.3133379263205 2021 92.0835955841022