-75.59% is the change from 635 to 155
Calculation steps:
[( 155 - 635 ) ÷ 635] x 100 = -75.59%
Formula
Percentage change = [(155 - 635) / 635] x 100
Subtract the new number by the original number
155 - 635 = -480
-480 ÷ 635 = -0.7559055118110236
-0.7559055118110236 x 100 = -75.59%