Year Number 1996 100 1998 100 2000 100 2002 100 2003 100 2004 88.461540222168 2005 95.6937789916992 2006 92.8229675292969 2007 90.9090881347656 2008 90.8653869628906 2009 91.9431304931641 2010 90.9952621459961 2011 90.6103286743164 2012 80.2816925048828 2013 81.2206573486328 2014 81.25 2015 79.523811340332 2016 84.7619018554688 2017 85.2380981445313 2018 84.2857131958008 2019 83.3333358764648 2020 86.1904754638672 2021 87.6190490722656 2022 88.6792449951172