-1.96% is the change from 511 to 501
Calculation steps:
[( 501 - 511 ) ÷ 511] x 100 = -1.96%
Formula
Percentage change = [(501 - 511) / 511] x 100
Subtract the new number by the original number
501 - 511 = -10
-10 ÷ 511 = -0.019569471624266144
-0.019569471624266144 x 100 = -1.96%