-66.97% is the change from 669 to 221
Calculation steps:
[( 221 - 669 ) ÷ 669] x 100 = -66.97%
Formula
Percentage change = [(221 - 669) / 669] x 100
Subtract the new number by the original number
221 - 669 = -448
-448 ÷ 669 = -0.6696562032884903
-0.6696562032884903 x 100 = -66.97%