Year % 2010 11.0965187240149 2011 12.0225489372009 2012 10.9835385205433 2013 10.1769821077429 2014 9.67766580307963 2015 9.93939163995331 2016 10.5859782359031 2017 11.4954417188885 2018 11.4812432073764 2019 11.5463919967068 2020 11.3681558222766 2021 12.1401371939043