Jun

Feb

Mar

Apr

May

June

July

Aug

Sep

Oct

Nov

Dec

1984-1993

23.3

27.9

18.9

5.2

−23.2

−23.2

−33.3

−39.7

−43.2

−37.1

−12.7

21.1

1994-2003

49.9

11.5

8.4

9.4

−18.6

−29.1

−42.1

−39.8

−29.3

−13.8

4.1

56.1

2004-2016

22.1

22.1

12.1

−13.1

−16.2

−41.5

−48.3

−49.2

−27.2

−10.6

30.6

14.5

N=Average(D)

31.7

20.5

13.4

0.5

−19.4

−31.5

−41.3

−42.1

−33.2

−20.8

7.3

30.6