I'm still not fully convinced we know the final mintages for all the 2014 releases, let alone the 2016 ones.
I've found far more 2014-dated coins in circulation than I expected, based on the figures published on the RAM website, and I strongly suspect that they were still minting them in the second half of 2015.
Unfortunately, I won't be able to confirm this until November, but even then, it will be at least another year or two on top of that before we know the final figures for 2016.
The only way you can really estimate this is to start noodling, but even, you still have to factor in the geographical distribution of the coins and the fact that many of them have still not been minted or released yet.