-63.86% is the change from 855 to 309
Calculation steps:
[( 309 - 855 ) ÷ 855] x 100 = -63.86%
Formula
Percentage change = [(309 - 855) / 855] x 100
Subtract the new number by the original number
309 - 855 = -546
-546 ÷ 855 = -0.6385964912280702
-0.6385964912280702 x 100 = -63.86%