pre_text: 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: .
post_text: .
table: (in millions)
table: For the years ending December 31,
table: 2018 $64
table: 2019 54
table: 2020 52
table: 2021 19
table: 2022 16
question: Analyse this data from a financial earnings document. what was the percent of the decline in amortization expense for other intangible assets from 2016 to 2017