Year Percent 2000 9.69267 2001 9.77511 2002 9.85771 2003 9.94081 2004 10.02424 2005 10.10801 2006 10.19211 2007 10.27675 2008 10.36152 2009 10.48359 2010 10.6144 2011 10.75454 2012 10.90486 2013 11.06572 2014 11.23775 2015 11.42188 2016 11.61879 2017 11.82919 2018 12.05412 2019 12.29402 2020 12.55032 2021 12.82352 2022 12.92207