Year % 2000 27.834 2001 28.902 2002 28.767 2003 30.373 2004 29.421 2005 31.596 2006 30.697 2007 29.5 2008 29.289 2009 28.907 2010 27.845 2011 23.764 2012 22.924 2013 24.341 2014 26.307 2015 27.525 2016 23.02 2017 23.96 2018 26.2 2019 26.128 2020 26.987 2021 27.57 2022 25.845