-66.72% is the change from 664 to 221
Calculation steps:
[( 221 - 664 ) ÷ 664] x 100 = -66.72%
Formula
Percentage change = [(221 - 664) / 664] x 100
Subtract the new number by the original number
221 - 664 = -443
-443 ÷ 664 = -0.6671686746987951
-0.6671686746987951 x 100 = -66.72%