Year Number 1996 0.809140563011169 1998 0.876508176326752 2000 0.839712262153625 2002 0.83394581079483 2003 0.833284139633179 2004 0.762897849082947 2005 1.26157879829407 2006 1.07941830158234 2007 0.99100661277771 2008 0.977942824363709 2009 1.01633048057556 2010 0.992874681949615 2011 0.993217349052429 2012 0.559754252433777 2013 0.591498136520386 2014 0.507215321063995 2015 0.436043590307236 2016 0.558649241924286 2017 0.637252509593964 2018 0.614950120449066 2019 0.561684668064117 2020 0.650380730628967 2021 0.722857356071472 2022 0.812607884407043