-97.83% is the change from 966 to 21
Calculation steps:
[( 21 - 966 ) ÷ 966] x 100 = -97.83%
Formula
Percentage change = [(21 - 966) / 966] x 100
Subtract the new number by the original number
21 - 966 = -945
-945 ÷ 966 = -0.9782608695652174
-0.9782608695652174 x 100 = -97.83%