274.1% is the change from 166 to 621
Calculation steps:
[( 621 - 166 ) ÷ 166] x 100 = 274.1%
Formula
Percentage change = [(621 - 166) / 166] x 100
Subtract the new number by the original number
621 - 166 = 455
455 ÷ 166 = 2.7409638554216866
2.7409638554216866 x 100 = 274.1%