-75.7% is the change from 646 to 157
Calculation steps:
[( 157 - 646 ) ÷ 646] x 100 = -75.7%
Formula
Percentage change = [(157 - 646) / 646] x 100
Subtract the new number by the original number
157 - 646 = -489
-489 ÷ 646 = -0.7569659442724458
-0.7569659442724458 x 100 = -75.7%