-15.66% is the change from 83 to 70
Calculation steps:
[( 70 - 83 ) ÷ 83] x 100 = -15.66%
Formula
Percentage change = [(70 - 83) / 83] x 100
Subtract the new number by the original number
70 - 83 = -13
-13 ÷ 83 = -0.1566265060240964
-0.1566265060240964 x 100 = -15.66%