-70.64% is the change from 855 to 251
Calculation steps:
[( 251 - 855 ) ÷ 855] x 100 = -70.64%
Formula
Percentage change = [(251 - 855) / 855] x 100
Subtract the new number by the original number
251 - 855 = -604
-604 ÷ 855 = -0.7064327485380117
-0.7064327485380117 x 100 = -70.64%