-36.66% is the change from 521 to 330
Calculation steps:
[( 330 - 521 ) ÷ 521] x 100 = -36.66%
Formula
Percentage change = [(330 - 521) / 521] x 100
Subtract the new number by the original number
330 - 521 = -191
-191 ÷ 521 = -0.3666026871401152
-0.3666026871401152 x 100 = -36.66%