Year % 2000 6.815144766146992 2001 7.395873880887508 2002 7.943067033976128 2003 8.956960062039554 2004 10.06856730422231 2005 10.70786920589293 2006 11.184439041333805 2007 12.309820193637629 2008 11.203170028818452 2009 11.143166245943027 2010 11.203007518797 2011 11.859086152772935 2012 13.643235071806497 2013 14.70588235294117 2014 15.614156835530874 2015 15.084915084915082 2016 14.843750000000002 2017 15.279106858054222 2018 15.318471337579613 2019 15.398773006134963 2020 16.345270890725438 2021 17.824377457404978 2022 19.18278228321896 2023 20.767716535433074