-34.13% is the change from 501 to 330
Calculation steps:
[( 330 - 501 ) ÷ 501] x 100 = -34.13%
Formula
Percentage change = [(330 - 501) / 501] x 100
Subtract the new number by the original number
330 - 501 = -171
-171 ÷ 501 = -0.3413173652694611
-0.3413173652694611 x 100 = -34.13%