-75% is the change from 644 to 161
Calculation steps:
[( 161 - 644 ) ÷ 644] x 100 = -75%
Formula
Percentage change = [(161 - 644) / 644] x 100
Subtract the new number by the original number
161 - 644 = -483
-483 ÷ 644 = -0.75
-0.75 x 100 = -75%
Example