1 year ago, on December 1, 2014, MINT had a total coin supply base of 20,327,200,230
Today, on December 1, 2015, MINT had a total coin supply base of 22,480,228,460
The difference, is an increase of 2,153,028,230 coins, or 10.6%, year over year.
Note:Last year, during this time, Mintcoin was still staking/minting at the 20% APR (annual percentage rate) up through about December 15th 2014, or thereabouts when the rate dropped to the 15% APR.
Conclusion:10.6% divided by 15% = 70.6%
Thus, overall, 70.6% of the coins were being actively staked/minted in the last year.
Assuming the same overall minting participation rate going forward, we can expect the MINT coin supply to grow by roughly 7.6% over the next year. It is worth noting that this is a rate comparable to Bitcoin's current coin supply growth rate.