-35.42% is the change from 511 to 330
Calculation steps:
[( 330 - 511 ) ÷ 511] x 100 = -35.42%
Formula
Percentage change = [(330 - 511) / 511] x 100
Subtract the new number by the original number
330 - 511 = -181
-181 ÷ 511 = -0.3542074363992172
-0.3542074363992172 x 100 = -35.42%