-13.94% is the change from 947 to 815
Calculation steps:
[( 815 - 947 ) ÷ 947] x 100 = -13.94%
Formula
Percentage change = [(815 - 947) / 947] x 100
Subtract the new number by the original number
815 - 947 = -132
-132 ÷ 947 = -0.13938753959873285
-0.13938753959873285 x 100 = -13.94%