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