Year % 2000 8.6 2001 8.87 2004 7.85 2005 6.26 2006 5.61 2007 5.17 2008 8.43 2014 3.89 2015 2.62 2016 1.96 2017 1.88 2018 1.72 2019 2.75 2020 2.75 2021 2.47