Year % 2009 3.28697148338664 2010 2.96818471895203 2011 2.22411986474196 2012 1.6697936801687 2013 1.30683882837442 2014 1.08033805274768 2015 1.23698687005173 2016 1.38335895995773 2017 1.61364907195792 2018 1.95231785727138 2019 1.85839038526169 2020 2.18290550467845 2021 1.8617019769322 2022 1.77974031138528