-66.36% is the change from 657 to 221
Calculation steps:
[( 221 - 657 ) ÷ 657] x 100 = -66.36%
Formula
Percentage change = [(221 - 657) / 657] x 100
Subtract the new number by the original number
221 - 657 = -436
-436 ÷ 657 = -0.6636225266362252
-0.6636225266362252 x 100 = -66.36%