-18.01% is the change from 644 to 528
Calculation steps:
[( 528 - 644 ) ÷ 644] x 100 = -18.01%
Formula
Percentage change = [(528 - 644) / 644] x 100
Subtract the new number by the original number
528 - 644 = -116
-116 ÷ 644 = -0.18012422360248448
-0.18012422360248448 x 100 = -18.01%
Example