-66.81% is the change from 949 to 315
Calculation steps:
[( 315 - 949 ) ÷ 949] x 100 = -66.81%
Formula
Percentage change = [(315 - 949) / 949] x 100
Subtract the new number by the original number
315 - 949 = -634
-634 ÷ 949 = -0.6680716543730242
-0.6680716543730242 x 100 = -66.81%