Year % 2007 15.6634827574928 2008 17.9548517587487 2009 4.07968103580839 2010 1.49040679096377 2011 10.6178209397358 2012 10.8206414155406 2013 10.3922915102556 2014 10.4290365555203 2015 12.3756754704187 2016 11.3716903589116 2017 7.18474373156024 2018 8.78249580958093 2019 7.95143250776331 2020 6.9321355965287 2021 6.75948006811289 2022 5.68715827728218