Found my notes, but can't remember where I got the figures.
No 67 blocks cast, should have left over 65/66 casting.
latest known block cast in 66 is 10-31-66
first known block cast in 68 is 4-15-68
69 blocks cast, 5-9-69, 5-19-69, 5-26-69, 7-28-69, 8-18-69, 10-23-69