-66.63% is the change from 959 to 320
Calculation steps:
[( 320 - 959 ) ÷ 959] x 100 = -66.63%
Formula
Percentage change = [(320 - 959) / 959] x 100
Subtract the new number by the original number
320 - 959 = -639
-639 ÷ 959 = -0.6663190823774765
-0.6663190823774765 x 100 = -66.63%