$MRK Dark Cloud Cover Pattern 
Daily appearances since 2010-01-04: 90
Performance (Close) 5 days later ±:
Avg: -0.07
Worst: -5.20
Best: 4.08 

10 days later:
Avg: -0.02
Worst: -5.74
Best: 4.26 

30 days later:
Avg: 0.04
Worst: -14.32
Best: 8.15