-66.87% is the change from 664 to 220
Calculation steps:
[( 220 - 664 ) ÷ 664] x 100 = -66.87%
Formula
Percentage change = [(220 - 664) / 664] x 100
Subtract the new number by the original number
220 - 664 = -444
-444 ÷ 664 = -0.6686746987951807
-0.6686746987951807 x 100 = -66.87%