-29.89% is the change from 950 to 666
Calculation steps:
[( 666 - 950 ) ÷ 950] x 100 = -29.89%
Formula
Percentage change = [(666 - 950) / 950] x 100
Subtract the new number by the original number
666 - 950 = -284
-284 ÷ 950 = -0.29894736842105263
-0.29894736842105263 x 100 = -29.89%