Year Percent 2000 91.21344 2001 91.21344 2002 91.21344 2003 91.21344 2004 91.21344 2005 91.58427 2006 91.95559 2007 92.3274 2008 92.69969 2009 93.07248 2010 93.44574 2011 93.8195 2012 94.19375 2013 94.56848 2014 94.9437 2015 95.3194 2016 95.6956 2017 96.07228 2018 96.44945 2019 96.82711 2020 97.20525 2021 97.58388 2022 97.963