2007 December 2008 March May July October December 2009 March May August October December 2010 March May July October December 2011 March May July October December

2012 March-April May-June July-August October-November 2013 December(12)-January March-April May-June July-August September-October November - February 2014 March - April May - June July - August September - November December - February 2015 March - April May - June July - August October - November December - February

(c) Bill Stevenson 2013

2016 March - April May - June July - September October - November December - February 2017 March - April May - June July - September October - November December - March 2018 2018 March - April

May - June