-30.11% is the change from 950 to 664
Calculation steps:
[( 664 - 950 ) ÷ 950] x 100 = -30.11%
Formula
Percentage change = [(664 - 950) / 950] x 100
Subtract the new number by the original number
664 - 950 = -286
-286 ÷ 950 = -0.30105263157894735
-0.30105263157894735 x 100 = -30.11%