Year % 2001 16.4078012980366 2002 14.818094498795128 2003 15.123911797154655 2004 18.847234055472054 2005 20.129052610586747 2006 18.600728849802728 2007 17.806747060543167 2008 16.06228828640929 2009 21.271622236160603 2010 19.98375219505511 2011 21.596332760878973 2012 20.997167219365913 2013 21.041597644551196 2014 20.343423449973884 2015 20.732092633469836 2016 21.018429557699744 2017 20.689248298024037 2018 20.956295518160857 2019 20.706074878475533 2020 21.467246416861876 2021 24.35770144912729 2022 24.280371786523073 2023 22.971733777570996