Year

January

February

March

April

May

June

July

August

September

October

November

December

1987

0.3

1.3

0.7

0.7

1.2

0.3

0.8

0.2

0

0.8

0.3

0.5

1988

0

0

0.3

0

0.5

0.3

0.5

0.5

0.5

0

0.3

0

1989

0.7

0

0

0.3

0.5

0

0.8

0.2

1

0

0

0.5

1990

1

0.7

0.3

1

0.5

0

0.2

0.8

1.5

0.8

0.8

1

1991

0.3

0

0

0.7

0.8

0

1.2

0.8

0.5

0

0.3

0.5

1992

2.3

0.3

0.7

0.7

1

1

1

0.5

0

0.3

1

0

1993

1

0.3

0.7

0.3

0.5

0.7

0

0.5

0.5

0.8

1.3

0.5

1994

1

0.7

0.3

0.3

0

0

0.2

0.2

1

0.3

0.3

0.5

1995

0.7

1.3

0

1.3

0

0.7

4.5

4.5

1

2

1

1.5

1996

0.7

0.7

2.3

0

1

2

1

1

1.5

1

0.3

2.5

1997

1.3

0

0.7

1.3

1.5

0.7

1

1

0.5

1

0.8

4

1998

1.3

4

1.3

2.3

0.8

2

0.8

0.8

2.5

0.3

1

0

1999

1

0.7

2

2

0.2

0.7

0.8

0.8

1.5

1.3

1

0.5

2000

1

1

1.3

0

0.8

1

0.2

0.2

1

0.3

0.3

1.5

2001

0.3

1

0

1

1.5

1

1

1

1.5

1

0

1

2002

1.7

1.3

1

0

3

1

1.5

1.5

2

0.3

2

2

2003

1.3

0.7

1.7

1.3

2

1.6

1.3

1.3

5

1.7

2

1.5

2004

0.3

1.3

1.7

2

0.8

1.6

1.5

1.5

2

2

1.3

1.5

2005

0.3

3.3

1

1

1

1.6

1.5

1.5

2

3

1.6

1

2006

1.3

0.7

0.3

0.3

1.4

1.6

1.3

1.3

1.5

2

3.6

1.5

2007

2

1.3

1.7

0.7

2.5

1.6

1

1

1.5

2

2

2.5

2008

1.7

0.7

0.7

2.3

0.2

1.6

1

1

2.5

2

1

2.5

2009

1.3

0

1

0.7

0

0

0.5

0.5

0

2.3

0.3

0.5

2010

0

1

0.3

0

0.8

0

1.5

1.5

0.5

1.3

0.3

0.5

2011

0.3

0.7

1.7

0.3

0.2

0.3

0.2

2

0

1.3

0.6

1.5

2012

0.3

1

0

0.7

0.2

1.6

0.8

1

0

0.7

0.3

0

2013

0

0

0

1.3

3

1.6

0.2

0.5

1.5

2.3

1

2.5

2014

1.7

1

1.7

2

2

1.3

1

1.5

1.5

1.3

0.6

2

2015

0.7

1.7

1.3

0.7

1.5

1

0.8

0.8

1.5

1.3

1.6

2.5

2016

1.7

0.7

0.7

1.3

1.2

0.7

0.5

0.5

2.5

1

1.3

0.5

2017

1.7

0.7

1.7

1.3

1.2

1.6

1.1

1.3

2

1.7

1

1.5