-1.76% is the change from 511 to 502
Calculation steps:
[( 502 - 511 ) ÷ 511] x 100 = -1.76%
Formula
Percentage change = [(502 - 511) / 511] x 100
Subtract the new number by the original number
502 - 511 = -9
-9 ÷ 511 = -0.01761252446183953
-0.01761252446183953 x 100 = -1.76%