-39.61% is the change from 813 to 491
Calculation steps:
[( 491 - 813 ) ÷ 813] x 100 = -39.61%
Formula
Percentage change = [(491 - 813) / 813] x 100
Subtract the new number by the original number
491 - 813 = -322
-322 ÷ 813 = -0.3960639606396064
-0.3960639606396064 x 100 = -39.61%