Year % 2001 16.31164021219908 2002 12.416634238995378 2003 13.735053103260467 2004 17.55875166547383 2005 18.66268744163905 2006 18.46072861578502 2007 17.369748916868353 2008 14.745783016377773 2009 14.394328182319288 2010 14.710458372671049 2011 19.531680386825407 2012 16.93746523623152 2013 17.929092126696435 2014 15.63125246765657 2015 19.896154203705294 2016 20.947069814876244 2017 19.73472197474562 2018 18.88613134413209 2019 18.81382579793654 2020 20.197086431733048 2021 23.815853218774745 2022 26.097712103717747 2023 26.270219702536508