-56.43% is the change from 521 to 227
Calculation steps:
[( 227 - 521 ) ÷ 521] x 100 = -56.43%
Formula
Percentage change = [(227 - 521) / 521] x 100
Subtract the new number by the original number
227 - 521 = -294
-294 ÷ 521 = -0.564299424184261
-0.564299424184261 x 100 = -56.43%