Given that there's only been about 4 cruising cat capsizes in the last 20
years,
its a little hard to talk about "higher %"

with only 30 cruising cats out there, that is about 14%

How many monos have sunk in the last 20 years?

From winds? with about 10,000 monos out there 2 is about 0.02%.

if you are thinking of boats sinking due to hitting the hits, there is no
difference between cats and mono's.