-66.94% is the change from 971 to 321
Calculation steps:
[( 321 - 971 ) ÷ 971] x 100 = -66.94%
Formula
Percentage change = [(321 - 971) / 971] x 100
Subtract the new number by the original number
321 - 971 = -650
-650 ÷ 971 = -0.6694129763130793
-0.6694129763130793 x 100 = -66.94%