-68.97% is the change from 506 to 157
Calculation steps:
[( 157 - 506 ) ÷ 506] x 100 = -68.97%
Formula
Percentage change = [(157 - 506) / 506] x 100
Subtract the new number by the original number
157 - 506 = -349
-349 ÷ 506 = -0.6897233201581028
-0.6897233201581028 x 100 = -68.97%