Blue 110s were made in 83 and 84. I don't know of any specific production number of blue trikes or red trikes. But if you look at what people have and the used parts that pop up, it would be easy to say less than 10% of 110 production were blue. The rarer trikes are the blue 83 atc70. They were Christmas giveaways and there was only one per dealership, and this was in 1983.
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90