-63.07% is the change from 639 to 236
Calculation steps:
[( 236 - 639 ) ÷ 639] x 100 = -63.07%
Formula
Percentage change = [(236 - 639) / 639] x 100
Subtract the new number by the original number
236 - 639 = -403
-403 ÷ 639 = -0.6306729264475743
-0.6306729264475743 x 100 = -63.07%