Year % 2001 20.32642218190294 2002 21.097642995376166 2003 19.86647878819958 2004 24.077786028769022 2005 20.189601497790136 2006 18.953091607611146 2007 22.024425893245017 2008 20.299353348328417 2009 25.968841784529296 2010 20.450797611011904 2011 22.60726171201707 2012 18.79059205730637 2013 27.697763262430936 2014 27.926010326020197 2015 24.59122626335096 2016 20.096916152355444 2017 24.90558020191582 2018 23.09821736447662 2019 23.831044229551956 2020 28.902431496472786 2021 24.35770144912729 2022 37.09645656214248