Question: Year 2 0 1 5 / 2 0 1 6 / 2 0 1 7 / 2 0 1 8 / 2 0 1 9

Year 2015/2016/2017/2018/2019
Sales 15.80/15.52/15.86/16.58/16.38
from 2015 to 2019, were there any one-year intervals during which the average rate of change was negative? If so, when?
2015-2016
2016-2017
2017-2018
2018-2019
No such intervals

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