-37.73% is the change from 811 to 505
Calculation steps:
[( 505 - 811 ) ÷ 811] x 100 = -37.73%
Formula
Percentage change = [(505 - 811) / 811] x 100
Subtract the new number by the original number
505 - 811 = -306
-306 ÷ 811 = -0.37731196054254007
-0.37731196054254007 x 100 = -37.73%