-40.7% is the change from 516 to 306
Calculation steps:
[( 306 - 516 ) ÷ 516] x 100 = -40.7%
Formula
Percentage change = [(306 - 516) / 516] x 100
Subtract the new number by the original number
306 - 516 = -210
-210 ÷ 516 = -0.4069767441860465
-0.4069767441860465 x 100 = -40.7%