-19.79% is the change from 970 to 778
Calculation steps:
[( 778 - 970 ) ÷ 970] x 100 = -19.79%
Formula
Percentage change = [(778 - 970) / 970] x 100
Subtract the new number by the original number
778 - 970 = -192
-192 ÷ 970 = -0.1979381443298969
-0.1979381443298969 x 100 = -19.79%