.
humana inc . notes to consolidated financial statements 2014 ( continued ) amortization expense for other intangible assets was approximately $ 75 million in 2017 , $ 77 million in 2016 , and $ 93 million in 2015 . the following table presents our estimate of amortization expense for each of the five next succeeding fiscal years: .
what was the ratio of the amortization expense for other intangible assets from to 20192018
the 2018 of ( in millions ) is $ 64 ; the 2019 of ( in millions ) is 54 ;
( in millions )
for the years ending december 31,
2018 $ 64
2019 54
2020 52
2021 19
2022 16