-66.99% is the change from 936 to 309
Calculation steps:
[( 309 - 936 ) ÷ 936] x 100 = -66.99%
Formula
Percentage change = [(309 - 936) / 936] x 100
Subtract the new number by the original number
309 - 936 = -627
-627 ÷ 936 = -0.6698717948717948
-0.6698717948717948 x 100 = -66.99%