-1.02% is the change from 491 to 486
Calculation steps:
[( 486 - 491 ) ÷ 491] x 100 = -1.02%
Formula
Percentage change = [(486 - 491) / 491] x 100
Subtract the new number by the original number
486 - 491 = -5
-5 ÷ 491 = -0.010183299389002037
-0.010183299389002037 x 100 = -1.02%