299.4% is the change from 166 to 663
Calculation steps:
[( 663 - 166 ) ÷ 166] x 100 = 299.4%
Formula
Percentage change = [(663 - 166) / 166] x 100
Subtract the new number by the original number
663 - 166 = 497
497 ÷ 166 = 2.9939759036144578
2.9939759036144578 x 100 = 299.4%