Year Percent 2000 90.37987 2001 90.3628 2002 90.29791 2003 90.65217 2004 91.01527 2005 91.38715 2006 91.7673 2007 92.1555 2008 92.55133 2009 92.95462 2010 93.36868 2011 93.80838 2012 94.24808 2013 94.68801 2014 95.12804 2015 95.56809 2016 96.00804 2017 96.44778 2018 96.8872 2019 96.88751 2020 96.88784 2021 96.88823 2022 96.88866