-66.41% is the change from 920 to 309
Calculation steps:
[( 309 - 920 ) ÷ 920] x 100 = -66.41%
Formula
Percentage change = [(309 - 920) / 920] x 100
Subtract the new number by the original number
309 - 920 = -611
-611 ÷ 920 = -0.6641304347826087
-0.6641304347826087 x 100 = -66.41%