There is actually no formula. The algorithm creates exactly 15,626,576 new units each year. Since the ratio between total existing coins and the constant newly created coins becomes bigger, the inflation decreases from year to year.
It is annoying to constantly answer the question what the total amount of Ether(eum) will be. There will be no final amount.
I created this thread to show how many Ether will be created in the next 100 years. Year 0 = 2015.
As you see, there are created exactly 15,626,576 Ether each year (it is 26% of the originally created 60,102,216 Ether).
Nice results, where is the formula?
POW will end this year, but nowhere atm is noticed the POS reward, so I really wonder how did you get those result ...