-64.42% is the change from 638 to 227
Calculation steps:
[( 227 - 638 ) ÷ 638] x 100 = -64.42%
Formula
Percentage change = [(227 - 638) / 638] x 100
Subtract the new number by the original number
227 - 638 = -411
-411 ÷ 638 = -0.6442006269592476
-0.6442006269592476 x 100 = -64.42%