-61.3% is the change from 664 to 257
Calculation steps:
[( 257 - 664 ) ÷ 664] x 100 = -61.3%
Formula
Percentage change = [(257 - 664) / 664] x 100
Subtract the new number by the original number
257 - 664 = -407
-407 ÷ 664 = -0.6129518072289156
-0.6129518072289156 x 100 = -61.3%