-37.45% is the change from 817 to 511
Calculation steps:
[( 511 - 817 ) ÷ 817] x 100 = -37.45%
Formula
Percentage change = [(511 - 817) / 817] x 100
Subtract the new number by the original number
511 - 817 = -306
-306 ÷ 817 = -0.37454100367197063
-0.37454100367197063 x 100 = -37.45%