-78.88% is the change from 644 to 136
Calculation steps:
[( 136 - 644 ) ÷ 644] x 100 = -78.88%
Formula
Percentage change = [(136 - 644) / 644] x 100
Subtract the new number by the original number
136 - 644 = -508
-508 ÷ 644 = -0.7888198757763976
-0.7888198757763976 x 100 = -78.88%