2018 South Dakota, Washington
2017 Colorado, Washington
2016 Oregon, Washington
2015 Utah, Washington
2014 Wisconsin and Minnesota, Washington
2013 Colorado, Washington
2012 Nevada and California, Washington
2011 Washington only
2010 Washington only
2009 Oregon, Washington
2008 Idaho, Washington
2007 Oregon, Washington
2006 Montana and Wyoming, Washington
2005 California, Utah, Washington
2004 & prior, Washington, California, Utah, Oregon.