-62.8% is the change from 664 to 247
Calculation steps:
[( 247 - 664 ) ÷ 664] x 100 = -62.8%
Formula
Percentage change = [(247 - 664) / 664] x 100
Subtract the new number by the original number
247 - 664 = -417
-417 ÷ 664 = -0.6280120481927711
-0.6280120481927711 x 100 = -62.8%