33.6% is the change from 381 to 509
Calculation steps:
[( 509 - 381 ) ÷ 381] x 100 = 33.6%
Formula
Percentage change = [(509 - 381) / 381] x 100
Subtract the new number by the original number
509 - 381 = 128
128 ÷ 381 = 0.3359580052493438
0.3359580052493438 x 100 = 33.6%