-30.98% is the change from 891 to 615
Calculation steps:
[( 615 - 891 ) ÷ 891] x 100 = -30.98%
Formula
Percentage change = [(615 - 891) / 891] x 100
Subtract the new number by the original number
615 - 891 = -276
-276 ÷ 891 = -0.30976430976430974
-0.30976430976430974 x 100 = -30.98%