-1.99% is the change from 957 to 938
Calculation steps:
[( 938 - 957 ) ÷ 957] x 100 = -1.99%
Formula
Percentage change = [(938 - 957) / 957] x 100
Subtract the new number by the original number
938 - 957 = -19
-19 ÷ 957 = -0.019853709508881923
-0.019853709508881923 x 100 = -1.99%