I've just spent ages doing a tally, and my results are...
Other xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx (34)
Vekoma xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx (32)
B&M xxxxxxxxxxxxxxxxxxxxxxx (23)
Arrow xxxxxxxxxxxxxxxxxxxx (20)
PTC/CCI xxxxxxxxxxxxxxxxxxx (19)
Intamin xxxxxxxxxxxxxxxxx (17)
Mack xxxxxxxxxxxxx (13)
Zierer xxxxxxxxxxxxx (13)
Miler xxxxxxxx (8)
Pinfari xxxxxxxx (8)
GCI xxxxxxxx (8)
Zamperla xxxxxxxx (8)
Gerstlauer xxxxxxx (7)
Schawzkopf xxxxxxx (7)
Maurer Söhne xxxxxxx (7)
Premier xxxxxx (6)
Morgan xxxxx (5)
Reverchon xxx (3)
Fabbri x (1)
S&S x (1)
(=238)
A few points:
-"Other" includes quite a large range of in-house manufacturers and quite a few "smaller" companies, or if RCDB was too vague I stuck a tally in there.
-Any coaster where the builder was PTC went into that column, even though the coaster may have been designed by another company. CCI have been stuck with them to show this (e.g- Boulder Dash)
-Annoyingly, I managed to miss 3 coasters somewhere.
-Racing/Duelling coasters have counted as multiple votes.
-Vekoma are =/.
That is all.