@rioit champ select question

what percentage of games will i get jungle if i que jungle/top compared to jungle/support. my second best role is support but i don't want to play it if it is gonna cause me to get jungle alot less often. i am getting close to diamond where the fact that i am not a very good top laner is costing me too many games but at the same time i don't want to be stuck support 9 out of 10 games. just trying to get an idea if should switch my selections or even move towards the old xx/mid to get the role iwant