2021
March cancelled l June 17 l September 16  l December 14
2020
March cancelled l June 18 l September cancelled  l December 17
2019
March 21  l  June 20  l  September 19 l  December 12
2018
March 14  l  June 21  l  September 20 l  December 13
2017
March 17  l  June 15  l  September 21  l  December 14
2016
March 17  l  June 16  l  September 15  l  December 15
2015
March 19  l  June 18  l  September cancelled  l   December 17
2014
March 20  l  June 19  l  September 18  l  December 18
2013
March 21  l  June 20  l  December 19
2012
March 13  l  June 14  l  September 13  l  December 13
2011
March 8  l  June 14  l  September 13  l  December 13
2010
February 16  l  April 20
2009
February 19  l  June 16  l  December 1
2008
May 5  l  December 18