This prediction is based on my math. At the moment, around 4.5 thousand knc is collected as fees per day. Multiply that by 365 and you get 1642k or 1.6 million KNC collected as fees. Deduct 30% and you get 1.1 Million burn per year. That equals to over 0.6% of tokens in circulation.
And this rate is increasing. The charts in https://tracker.kyber.network/ makes it quite clear that Kyber is growing. If price goes up to 33 - 35 cents, the burn rate will recent to around 0.5% tokens burned per year.