Correlations

2009

2010

2011

2012

Mean

2010

0.68^***

2011

0.53^***

0.47^**

2012

0.41^**

0.34^*

0.78^***

Mean

0.66^***

0.67^***

0.96^***

0.82^***

Variance

0.41^**

0.37^*

0.96^***

0.74^***

0.89^***