-66.53% is the change from 959 to 321
Calculation steps:
[( 321 - 959 ) ÷ 959] x 100 = -66.53%
Formula
Percentage change = [(321 - 959) / 959] x 100
Subtract the new number by the original number
321 - 959 = -638
-638 ÷ 959 = -0.6652763295099061
-0.6652763295099061 x 100 = -66.53%