Interesting. 25% at DLvl 0. Thanks.
Orb Ratio however varies with DLvl.
Much lower samples than OP's but should still show a nice relationship.
Code:Orb Ratio DLVL White Yellow Red Rainbow -40 0.262712 0.152542 0.186440678 0.398305 -20 0.25876 0.177898 0.169811321 0.393531 -9 0.352941 0.154412 0.139705882 0.352941 -7 0.277108 0.210843 0.162650602 0.349398 0 0.296167 0.202091 0.216027875 0.285714