-15.25% is the change from 977 to 828
Calculation steps:
[( 828 - 977 ) ÷ 977] x 100 = -15.25%
Formula
Percentage change = [(828 - 977) / 977] x 100
Subtract the new number by the original number
828 - 977 = -149
-149 ÷ 977 = -0.15250767656090072
-0.15250767656090072 x 100 = -15.25%