-41.03% is the change from 870 to 513
Calculation steps:
[( 513 - 870 ) ÷ 870] x 100 = -41.03%
Formula
Percentage change = [(513 - 870) / 870] x 100
Subtract the new number by the original number
513 - 870 = -357
-357 ÷ 870 = -0.4103448275862069
-0.4103448275862069 x 100 = -41.03%