-67.5% is the change from 680 to 221
Calculation steps:
[( 221 - 680 ) ÷ 680] x 100 = -67.5%
Formula
Percentage change = [(221 - 680) / 680] x 100
Subtract the new number by the original number
221 - 680 = -459
-459 ÷ 680 = -0.675
-0.675 x 100 = -67.5%