-38.82% is the change from 510 to 312
Calculation steps:
[( 312 - 510 ) ÷ 510] x 100 = -38.82%
Formula
Percentage change = [(312 - 510) / 510] x 100
Subtract the new number by the original number
312 - 510 = -198
-198 ÷ 510 = -0.38823529411764707
-0.38823529411764707 x 100 = -38.82%