Year Percent 2000 28.75498 2001 29.41398 2002 30.07871 2003 30.74919 2004 31.4254 2005 32.10736 2006 32.79505 2007 33.48849 2008 34.18766 2009 34.89257 2010 35.60322 2011 36.31962 2012 37.04175 2013 37.76962 2014 38.50323 2015 39.24258 2016 39.98766 2017 40.73849 2018 41.49506 2019 42.25737 2020 43.02541 2021 43.7992 2022 43.7992