-76.84% is the change from 639 to 148
Calculation steps:
[( 148 - 639 ) ÷ 639] x 100 = -76.84%
Formula
Percentage change = [(148 - 639) / 639] x 100
Subtract the new number by the original number
148 - 639 = -491
-491 ÷ 639 = -0.7683881064162754
-0.7683881064162754 x 100 = -76.84%