-30.03% is the change from 949 to 664
Calculation steps:
[( 664 - 949 ) ÷ 949] x 100 = -30.03%
Formula
Percentage change = [(664 - 949) / 949] x 100
Subtract the new number by the original number
664 - 949 = -285
-285 ÷ 949 = -0.30031612223393045
-0.30031612223393045 x 100 = -30.03%