-37.48% is the change from 819 to 512
Calculation steps:
[( 512 - 819 ) ÷ 819] x 100 = -37.48%
Formula
Percentage change = [(512 - 819) / 819] x 100
Subtract the new number by the original number
512 - 819 = -307
-307 ÷ 819 = -0.37484737484737485
-0.37484737484737485 x 100 = -37.48%