Maybe sun activity is connected with economic activity.

[NorthernWind]

1987 crash ( 'Black Monday' )
Asian financial crisis ( which affected not only Asia, of course ) -1997-1998
Global financial crisis - 2008-2009

 

[curryboy420]

When it's sunny I feel good

 

[Wolnir]

The UK is so depressing, nothing to do and the sky is grey all the time.