-59.89% is the change from 870 to 349
Calculation steps:
[( 349 - 870 ) ÷ 870] x 100 = -59.89%
Formula
Percentage change = [(349 - 870) / 870] x 100
Subtract the new number by the original number
349 - 870 = -521
-521 ÷ 870 = -0.5988505747126437
-0.5988505747126437 x 100 = -59.89%