Year Number 2003 36.6834182739258 2004 54.8543701171875 2005 50.970874786377 2006 42.512077331543 2007 37.1980667114258 2008 37.019229888916 2009 32.7014236450195 2010 51.6587677001953 2011 61.6113739013672 2012 60.1895751953125 2013 61.6113739013672 2014 60 2015 60.9523811340332 2016 61.9047622680664 2017 59.0476188659668 2018 61.3207550048828 2019 66.9811325073242 2020 68.8679275512695 2021 67.4528274536133 2022 69.8113174438477