-60.37% is the change from 858 to 340
Calculation steps:
[( 340 - 858 ) ÷ 858] x 100 = -60.37%
Formula
Percentage change = [(340 - 858) / 858] x 100
Subtract the new number by the original number
340 - 858 = -518
-518 ÷ 858 = -0.6037296037296037
-0.6037296037296037 x 100 = -60.37%