-31.32% is the change from 977 to 671
Calculation steps:
[( 671 - 977 ) ÷ 977] x 100 = -31.32%
Formula
Percentage change = [(671 - 977) / 977] x 100
Subtract the new number by the original number
671 - 977 = -306
-306 ÷ 977 = -0.3132036847492323
-0.3132036847492323 x 100 = -31.32%