Distribution of 86 GHz fractional linear polarization (red areas) for all sources in the sample, quasars, high optical polarization quasars (HPQ), low optical polarization quasars (LPQ), BL Lacs, and radio galaxies from top to bottom. N is the number of sources in 0.5% wide bins. Non-filled areas also include non-detection upper limits. Since we chose 3σ upper limits with a mean %, there are only a few detections at m_{L, 86} ≲ 0.96%.