Year % 2004 0 2008 8.004776 2010 22.50657 2011 21.82436 2012 7.734072 2013 23.27192 2014 10.63168 2015 8.538498 2016 5.604347 2017 4.306381 2018 0.3843372 2019 0.6391551 2020 0.2578875 2021 0.8728195