More usueful, if it's not too hard, would be "plus levels" -- the sum of levels in excess of 150.
so, for example, on las vegas
1. 166; 2. 165; 3. 163; 4.163; 5. 160; 6. 159; 7. 159; 8. 157; 9. 156;
10. 156; 11. 156; 12. 156; 13. 155; 14. 155; 15. 154; 16. 154; 17. 154;
18. 153; 19. 153; 20...