Year % 2006 5.8910574338906985 2007 -6.761807956968527 2008 6.051589799898575 2009 8.84912547410197 2010 10.31796102823803 2011 6.874906425794471 2012 9.1606779539489 2013 8.967572419229098 2014 11.005116839136354 2015 8.645325497831244 2016 7.795759332908964 2017 8.086336119875915 2018 7.146958102515977 2019 8.38767998036212 2020 7.799794633091857 2021 6.185881257748611 2022 0.26463731656321116 2023 3.5348656426446725