-67.78% is the change from 959 to 309
Calculation steps:
[( 309 - 959 ) ÷ 959] x 100 = -67.78%
Formula
Percentage change = [(309 - 959) / 959] x 100
Subtract the new number by the original number
309 - 959 = -650
-650 ÷ 959 = -0.6777893639207507
-0.6777893639207507 x 100 = -67.78%