-17.2% is the change from 977 to 809
Calculation steps:
[( 809 - 977 ) ÷ 977] x 100 = -17.2%
Formula
Percentage change = [(809 - 977) / 977] x 100
Subtract the new number by the original number
809 - 977 = -168
-168 ÷ 977 = -0.17195496417604914
-0.17195496417604914 x 100 = -17.2%