thanks to ST8, this is a list which map got picked how often:

cp_dustbowl (6 vs 6) – 36
cp_granary (6 vs 6) – 93
cp_gravelpit (6 vs 6) – 46
cp_well (6 vs 6) – 107
ctf_2fort (6 vs 6) – 46
ctf_turbine (6 vs 6) – 26