Below is percentile win rate for each team that won the IPL title from 2008 onwards. The stats in table is divided into four phases of a tournament (15 match per phase)
The third column is % Total win in that particular year for that team. The last column is KO(knock-out round) that features qualifer and eliminator matches.
For example in the first IPL edition (2008) Rajasthan Royals won the IPL beating Chennai Super Kings.
That year RR won 81.30% of their total matches, which is the highest % of win for any team in IPL history!. They always won more than 60 % of matches in each phase of that event.