-13.11% is the change from 938 to 815
Calculation steps:
[( 815 - 938 ) ÷ 938] x 100 = -13.11%
Formula
Percentage change = [(815 - 938) / 938] x 100
Subtract the new number by the original number
815 - 938 = -123
-123 ÷ 938 = -0.13113006396588486
-0.13113006396588486 x 100 = -13.11%