-20.7% is the change from 971 to 770
Calculation steps:
[( 770 - 971 ) ÷ 971] x 100 = -20.7%
Formula
Percentage change = [(770 - 971) / 971] x 100
Subtract the new number by the original number
770 - 971 = -201
-201 ÷ 971 = -0.2070030895983522
-0.2070030895983522 x 100 = -20.7%