-44.15% is the change from 915 to 511
Calculation steps:
[( 511 - 915 ) ÷ 915] x 100 = -44.15%
Formula
Percentage change = [(511 - 915) / 915] x 100
Subtract the new number by the original number
511 - 915 = -404
-404 ÷ 915 = -0.44153005464480877
-0.44153005464480877 x 100 = -44.15%