-67.2% is the change from 942 to 309
Calculation steps:
[( 309 - 942 ) ÷ 942] x 100 = -67.2%
Formula
Percentage change = [(309 - 942) / 942] x 100
Subtract the new number by the original number
309 - 942 = -633
-633 ÷ 942 = -0.6719745222929936
-0.6719745222929936 x 100 = -67.2%