-41.26% is the change from 870 to 511
Calculation steps:
[( 511 - 870 ) ÷ 870] x 100 = -41.26%
Formula
Percentage change = [(511 - 870) / 870] x 100
Subtract the new number by the original number
511 - 870 = -359
-359 ÷ 870 = -0.4126436781609195
-0.4126436781609195 x 100 = -41.26%