-15.76% is the change from 977 to 823
Calculation steps:
[( 823 - 977 ) ÷ 977] x 100 = -15.76%
Formula
Percentage change = [(823 - 977) / 977] x 100
Subtract the new number by the original number
823 - 977 = -154
-154 ÷ 977 = -0.15762538382804503
-0.15762538382804503 x 100 = -15.76%