Most of these are since 1996:

California.....2
Colorado.......0 (But we'll keep looking)
Michigan.......5
Maine..........6
Maryland.......4 + 1 Lightship
Delaware.......3 + 1 Lightship
Connecticut....1
Massachusetts..8
Florida........2
New Jersey.....5
New York.......2
Ohio...........2
Pennsylvania...1
Bermuda........2