-79.04% is the change from 644 to 135
Calculation steps:
[( 135 - 644 ) ÷ 644] x 100 = -79.04%
Formula
Percentage change = [(135 - 644) / 644] x 100
Subtract the new number by the original number
135 - 644 = -509
-509 ÷ 644 = -0.7903726708074534
-0.7903726708074534 x 100 = -79.04%