Year Number 2004 98.0582504272461 2005 99.5145645141602 2006 98.5507278442383 2007 100 2008 100 2009 100 2010 99.5260696411133 2011 99.5260696411133 2012 99.5260696411133 2013 99.5260696411133 2014 99.523811340332 2015 99.523811340332 2016 99.523811340332 2017 99.523811340332 2018 99.5283050537109 2019 99.5283050537109 2020 99.0566024780273 2021 99.0566024780273 2022 100