-69.17% is the change from 639 to 197
Calculation steps:
[( 197 - 639 ) ÷ 639] x 100 = -69.17%
Formula
Percentage change = [(197 - 639) / 639] x 100
Subtract the new number by the original number
197 - 639 = -442
-442 ÷ 639 = -0.6917057902973396
-0.6917057902973396 x 100 = -69.17%