284.94% is the change from 166 to 639
Calculation steps:
[( 639 - 166 ) ÷ 166] x 100 = 284.94%
Formula
Percentage change = [(639 - 166) / 166] x 100
Subtract the new number by the original number
639 - 166 = 473
473 ÷ 166 = 2.8493975903614457
2.8493975903614457 x 100 = 284.94%