Year % 2005 8 2006 7.80669144981413 2007 8.203125 2008 8.203125 2009 6.86456400742115 2010 6.77655677655678 2011 6.77655677655678 2012 13.8181818181818 2013 13.8181818181818 2014 13.8181818181818 2015 13.8181818181818 2017 24.3636363636364 2018 24.3636363636364 2019 24.3636363636364 2020 24.3636363636364 2021 24.3636363636364 2022 19.7080291970803 2023 19.7080291970803