-3.99% is the change from 977 to 938
Calculation steps:
[( 938 - 977 ) ÷ 977] x 100 = -3.99%
Formula
Percentage change = [(938 - 977) / 977] x 100
Subtract the new number by the original number
938 - 977 = -39
-39 ÷ 977 = -0.03991811668372569
-0.03991811668372569 x 100 = -3.99%