-36.66% is the change from 971 to 615
Calculation steps:
[( 615 - 971 ) ÷ 971] x 100 = -36.66%
Formula
Percentage change = [(615 - 971) / 971] x 100
Subtract the new number by the original number
615 - 971 = -356
-356 ÷ 971 = -0.3666323377960865
-0.3666323377960865 x 100 = -36.66%