-41.65% is the change from 521 to 304
Calculation steps:
[( 304 - 521 ) ÷ 521] x 100 = -41.65%
Formula
Percentage change = [(304 - 521) / 521] x 100
Subtract the new number by the original number
304 - 521 = -217
-217 ÷ 521 = -0.4165067178502879
-0.4165067178502879 x 100 = -41.65%