-16.07% is the change from 977 to 820
Calculation steps:
[( 820 - 977 ) ÷ 977] x 100 = -16.07%
Formula
Percentage change = [(820 - 977) / 977] x 100
Subtract the new number by the original number
820 - 977 = -157
-157 ÷ 977 = -0.16069600818833163
-0.16069600818833163 x 100 = -16.07%