-29.79% is the change from 977 to 686
Calculation steps:
[( 686 - 977 ) ÷ 977] x 100 = -29.79%
Formula
Percentage change = [(686 - 977) / 977] x 100
Subtract the new number by the original number
686 - 977 = -291
-291 ÷ 977 = -0.2978505629477994
-0.2978505629477994 x 100 = -29.79%