That's a ridiculous amount of corruption. How many provinces do you control? I'm assuming your empire is quite massive.
Placing your capital in the center of your empire will help with corruption.
Governors with good law traits, and buildings which give law bonuses will also reduce corruption.
Aside from that, getting rid of corrupt governors is always a step in the right direction. Send them watchtower building or brigand hunting and replace them with a more trustworthy substitute.
It's important to note that some family members who would be corrupt, horrible governors are fantastic generals....make sure your aware of all of your family member's strengths and weaknesses.
There is nothing else that I know of that reduces corruption.
I do not know if a cities garrison gives a law bonus, but I don't think so. They only give a happiness bonus AFAIK. (someone confirm this please)
Hope that helps
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