-78.98% is the change from 647 to 136
Calculation steps:
[( 136 - 647 ) ÷ 647] x 100 = -78.98%
Formula
Percentage change = [(136 - 647) / 647] x 100
Subtract the new number by the original number
136 - 647 = -511
-511 ÷ 647 = -0.7897990726429676
-0.7897990726429676 x 100 = -78.98%