Any chance of getting some numbers on mark drop rates?

[Game]

Funny thing: I found mark of lies and black soulstone in about 20baal and 30 duriel runs. Bosses dropped exactly what i needed - armor and belials tome (other drops are useless for me).
Also other players found some stones and marks pretty fast. That happened in first week of ladder.
Probably silent droprate nerf happened?

Drop rate has not been touched, I ensure you! I would definitely announce this ahead of time. This is just another fine example of RNG.

[Fitsu]

Drop rate has not been touched, I ensure you! I would definitely announce this ahead of time. This is just another fine example of RNG.

Btw, is it right that the drop rate on marks from time rift diablo are higher than normal diablo?