Year % 2000 10.007412898443292 2001 11.288318144159069 2002 12.82398016677935 2003 13.084504088907526 2004 13.689604685212302 2005 15.286729466203942 2006 16.096954630205104 2007 16.671909405473425 2008 17.217696853537785 2009 17.419756933624182 2010 17.194210275170985 2011 19.53313253012048 2012 20.1545949040939 2013 21.25461254612546 2014 20.934805626985323 2015 21.843148357870888 2016 22.14094809396539 2017 22.293166689308524 2018 22.045611610228065 2019 22.011331444759218 2020 22.865013774104696 2021 24.08233769972651 2022 24.55500437700613 2023 25.148279952550425