Year Number 1996 1.59574472904205 1998 3.72340416908264 2000 0.52910053730011 2002 1.05820107460022 2003 0 2004 0 2005 0 2006 0 2007 0 2008 0 2009 1.42180097103119 2010 0 2011 1.89573454856873 2012 1.89573454856873 2013 1.42180097103119 2014 0 2015 0.476190477609634 2016 0.952380955219269 2017 0.476190477609634 2018 0 2019 0 2020 0 2021 0 2022 0