Year % 2010 25.497548655532132 2011 25.289115671896145 2012 25.230038595307928 2013 25.18944934347342 2014 25.18368583690331 2015 25.12876200930935 2016 25.128848803858315 2017 25.09266092571375 2018 25.089407473117397 2019 25.045375518371344 2020 25.05661541206748 2021 25.04957849103104