-66.38% is the change from 919 to 309
Calculation steps:
[( 309 - 919 ) ÷ 919] x 100 = -66.38%
Formula
Percentage change = [(309 - 919) / 919] x 100
Subtract the new number by the original number
309 - 919 = -610
-610 ÷ 919 = -0.6637649619151251
-0.6637649619151251 x 100 = -66.38%