Answer & Explanation:
There're 2 ways to indicate the inflation rate:
(1) Inflation rate from 2014:
2015 is 5.7%
2016 is 8.6%
2017 is 8.6%
2018 is 15.9%
(2) Inflation rate compare to previous year
= (price index this year - price index previous year)/ price index previous year
2015 is 5.7% = (105.7-100)/100
2016 is 2.74% = (108.6 - 105.7)/ 105.7
2017 is 6.72% = (115.9 - 108.6)/108.6
2018 is 3.88% = (120.4 - 115.9)/115.9