Year Percent 2000 87.47411 2001 87.47411 2002 87.47411 2003 87.47411 2004 87.84616 2005 88.21821 2006 88.59025 2007 88.9623 2008 89.33435 2009 89.7064 2010 90.07844 2011 90.45049 2012 90.82254 2013 91.19458 2014 91.56663 2015 91.93868 2016 92.31072 2017 92.68277 2018 93.05482 2019 93.1 2020 93.1 2021 93.20942 2022 93.20942