-40.9% is the change from 511 to 302
Calculation steps:
[( 302 - 511 ) ÷ 511] x 100 = -40.9%
Formula
Percentage change = [(302 - 511) / 511] x 100
Subtract the new number by the original number
302 - 511 = -209
-209 ÷ 511 = -0.4090019569471624
-0.4090019569471624 x 100 = -40.9%