Year Number 1996 0.767924547195435 1998 0.657050669193268 2000 0.902080297470093 2002 0.927854418754578 2003 0.894786238670349 2004 0.703926205635071 2005 0.605274677276611 2006 0.736678242683411 2007 0.634109556674957 2008 0.571973562240601 2009 0.567619025707245 2010 0.661366999149323 2011 0.611041307449341 2012 0.636465191841125 2013 0.748215436935425 2014 0.780257880687714 2015 0.613857269287109 2016 0.662796258926392 2017 0.642369627952576 2018 0.580257713794708 2019 0.630106985569 2020 0.709752976894379 2021 0.74846613407135 2022 0.723720729351044