Year Percent 2000 14.44271 2001 16.75049 2002 19.05827 2003 21.36606 2004 23.67384 2005 25.98162 2006 28.24257 2007 30.49588 2008 32.74155 2009 34.97958 2010 37.20997 2011 39.43272 2012 41.64783 2013 43.8553 2014 46.05513 2015 48.24731 2016 50.43186 2017 52.60877 2018 54.77804 2019 56.93966 2020 59.09365 2021 61.23999 2022 63.3787