-75.78% is the change from 644 to 156
Calculation steps:
[( 156 - 644 ) ÷ 644] x 100 = -75.78%
Formula
Percentage change = [(156 - 644) / 644] x 100
Subtract the new number by the original number
156 - 644 = -488
-488 ÷ 644 = -0.7577639751552795
-0.7577639751552795 x 100 = -75.78%