-87.98% is the change from 657 to 79
Calculation steps:
[( 79 - 657 ) ÷ 657] x 100 = -87.98%
Formula
Percentage change = [(79 - 657) / 657] x 100
Subtract the new number by the original number
79 - 657 = -578
-578 ÷ 657 = -0.8797564687975646
-0.8797564687975646 x 100 = -87.98%