-76.01% is the change from 646 to 155
Calculation steps:
[( 155 - 646 ) ÷ 646] x 100 = -76.01%
Formula
Percentage change = [(155 - 646) / 646] x 100
Subtract the new number by the original number
155 - 646 = -491
-491 ÷ 646 = -0.760061919504644
-0.760061919504644 x 100 = -76.01%