-67.44% is the change from 949 to 309
Calculation steps:
[( 309 - 949 ) ÷ 949] x 100 = -67.44%
Formula
Percentage change = [(309 - 949) / 949] x 100
Subtract the new number by the original number
309 - 949 = -640
-640 ÷ 949 = -0.6743940990516333
-0.6743940990516333 x 100 = -67.44%