-38.64% is the change from 810 to 497
Calculation steps:
[( 497 - 810 ) ÷ 810] x 100 = -38.64%
Formula
Percentage change = [(497 - 810) / 810] x 100
Subtract the new number by the original number
497 - 810 = -313
-313 ÷ 810 = -0.38641975308641974
-0.38641975308641974 x 100 = -38.64%