-64.32% is the change from 639 to 228
Calculation steps:
[( 228 - 639 ) ÷ 639] x 100 = -64.32%
Formula
Percentage change = [(228 - 639) / 639] x 100
Subtract the new number by the original number
228 - 639 = -411
-411 ÷ 639 = -0.6431924882629108
-0.6431924882629108 x 100 = -64.32%