-57.41% is the change from 810 to 345
Calculation steps:
[( 345 - 810 ) ÷ 810] x 100 = -57.41%
Formula
Percentage change = [(345 - 810) / 810] x 100
Subtract the new number by the original number
345 - 810 = -465
-465 ÷ 810 = -0.5740740740740741
-0.5740740740740741 x 100 = -57.41%