-64.71% is the change from 870 to 307
Calculation steps:
[( 307 - 870 ) ÷ 870] x 100 = -64.71%
Formula
Percentage change = [(307 - 870) / 870] x 100
Subtract the new number by the original number
307 - 870 = -563
-563 ÷ 870 = -0.6471264367816092
-0.6471264367816092 x 100 = -64.71%