-66.46% is the change from 638 to 214
Calculation steps:
[( 214 - 638 ) ÷ 638] x 100 = -66.46%
Formula
Percentage change = [(214 - 638) / 638] x 100
Subtract the new number by the original number
214 - 638 = -424
-424 ÷ 638 = -0.664576802507837
-0.664576802507837 x 100 = -66.46%