-69.37% is the change from 506 to 155
Calculation steps:
[( 155 - 506 ) ÷ 506] x 100 = -69.37%
Formula
Percentage change = [(155 - 506) / 506] x 100
Subtract the new number by the original number
155 - 506 = -351
-351 ÷ 506 = -0.6936758893280632
-0.6936758893280632 x 100 = -69.37%