North | Pacific | |||
Year | Spring | Summer | Fall | Winter |
1999 | 0.7 | 0.6 | 1.3 | 0.6 |
2000 | 0.9 | 0.9 | 0.5 | 0.6 |
2001 | 0.8 | 0.81 | 1 | 0.9 |
2002 | 0.9 | 1.3 | 1.2 | 1.1 |
2003 | 1.2 | 1 | 1 | 1.1 |
2004 | 1.2 | 1.5 | 1.3 | 1.3 |
2005 | 1.1 | 1.1 | 1.1 | 1.7 |
2006 | 1.2 | 1.3 | 1.3 | 1.1 |
2007 | 1.2 | 1.1 | 0.9 | 1.2 |
2008 | 1.1 | 1.3 | 1.4 | 0.9 |
2009 | 0.4 | 0.3 | 0.3 | 0.4 |
2010 | 0.3 | 0.4 | 0.4 | 0.3 |
2011 | 0.4 | 0.5 | 0.4 | 0.5 |
2012 | 0.5 | 0.5 | 0.5 | 0.3 |
2013 | 0.6 | 0.5 | 1.1 | 1.5 |
2014 | 1.8 | 1.5 | 1.6 | 1.6 |
2015 | 1.7 | 1.4 | 1.3 | 1.5 |
2016 | 1.7 | 1.5 | 1.6 | 1.6 |
2017 | 1.5 | 1.6 | 1.5 | 1.1 |