Year Number of 2000 5 2001 8 2002 7 2003 8 2004 16 2005 15 2006 19 2007 22 2008 17 2009 20 2010 27 2011 19 2012 20 2013 21 2014 20 2015 19 2016 25 2017 28 2018 59 2019 31 2020 57