-14.73% is the change from 971 to 828
Calculation steps:
[( 828 - 971 ) ÷ 971] x 100 = -14.73%
Formula
Percentage change = [(828 - 971) / 971] x 100
Subtract the new number by the original number
828 - 971 = -143
-143 ÷ 971 = -0.14727085478887744
-0.14727085478887744 x 100 = -14.73%