-14.64% is the change from 970 to 828
Calculation steps:
[( 828 - 970 ) ÷ 970] x 100 = -14.64%
Formula
Percentage change = [(828 - 970) / 970] x 100
Subtract the new number by the original number
828 - 970 = -142
-142 ÷ 970 = -0.1463917525773196
-0.1463917525773196 x 100 = -14.64%