-66.16% is the change from 913 to 309
Calculation steps:
[( 309 - 913 ) ÷ 913] x 100 = -66.16%
Formula
Percentage change = [(309 - 913) / 913] x 100
Subtract the new number by the original number
309 - 913 = -604
-604 ÷ 913 = -0.6615553121577218
-0.6615553121577218 x 100 = -66.16%