-91.72% is the change from 664 to 55
Calculation steps:
[( 55 - 664 ) ÷ 664] x 100 = -91.72%
Formula
Percentage change = [(55 - 664) / 664] x 100
Subtract the new number by the original number
55 - 664 = -609
-609 ÷ 664 = -0.9171686746987951
-0.9171686746987951 x 100 = -91.72%