-77.17% is the change from 644 to 147
Calculation steps:
[( 147 - 644 ) ÷ 644] x 100 = -77.17%
Formula
Percentage change = [(147 - 644) / 644] x 100
Subtract the new number by the original number
147 - 644 = -497
-497 ÷ 644 = -0.7717391304347826
-0.7717391304347826 x 100 = -77.17%