-4.11% is the change from 511 to 490
Calculation steps:
[( 490 - 511 ) ÷ 511] x 100 = -4.11%
Formula
Percentage change = [(490 - 511) / 511] x 100
Subtract the new number by the original number
490 - 511 = -21
-21 ÷ 511 = -0.0410958904109589
-0.0410958904109589 x 100 = -4.11%