-67.06% is the change from 671 to 221
Calculation steps:
[( 221 - 671 ) ÷ 671] x 100 = -67.06%
Formula
Percentage change = [(221 - 671) / 671] x 100
Subtract the new number by the original number
221 - 671 = -450
-450 ÷ 671 = -0.6706408345752608
-0.6706408345752608 x 100 = -67.06%