-12.9% is the change from 977 to 851
Calculation steps:
[( 851 - 977 ) ÷ 977] x 100 = -12.9%
Formula
Percentage change = [(851 - 977) / 977] x 100
Subtract the new number by the original number
851 - 977 = -126
-126 ÷ 977 = -0.12896622313203684
-0.12896622313203684 x 100 = -12.9%