-17.31% is the change from 491 to 406
Calculation steps:
[( 406 - 491 ) ÷ 491] x 100 = -17.31%
Formula
Percentage change = [(406 - 491) / 491] x 100
Subtract the new number by the original number
406 - 491 = -85
-85 ÷ 491 = -0.17311608961303462
-0.17311608961303462 x 100 = -17.31%