-3.33% is the change from 511 to 494
Calculation steps:
[( 494 - 511 ) ÷ 511] x 100 = -3.33%
Formula
Percentage change = [(494 - 511) / 511] x 100
Subtract the new number by the original number
494 - 511 = -17
-17 ÷ 511 = -0.033268101761252444
-0.033268101761252444 x 100 = -3.33%