-21.6% is the change from 977 to 766
Calculation steps:
[( 766 - 977 ) ÷ 977] x 100 = -21.6%
Formula
Percentage change = [(766 - 977) / 977] x 100
Subtract the new number by the original number
766 - 977 = -211
-211 ÷ 977 = -0.21596724667349027
-0.21596724667349027 x 100 = -21.6%