Number

Period

Average WL (mbsl)

Relative scale (high > low)

Probability (p)

1

1933-1953

-210.55

1 < 2

<0.0001 S

2

1954-1973

-209.77

1 < 3

0.1069 NS

3

1974-1993

-210.39

1 > 4

<0.0001 S

4

1994-2013

-211.84

2 > 3

<0.0001 S

2 > 4

<0.0001 S

3 > 4

<0.0001 S