I would be interested in this although I could see yellow being the rarest.

 

Silverstone, Sebring, Berlina and Spa are all very common colors.

Suzuka, White and Red are the rarest, with red being by far the least numerous color in recent get togethers. I've seen a recent surge in the number of white and Suzuka S2000's over the past year, but not red.

Rio Yellow might be the least common simply because it's only been abailable for one model year. Red is the rarest color over all the model years, by my observations.

 

That surprises me. I would have expected red to be one of the more popular colors.