-27.45% is the change from 521 to 378
Calculation steps:
[( 378 - 521 ) ÷ 521] x 100 = -27.45%
Formula
Percentage change = [(378 - 521) / 521] x 100
Subtract the new number by the original number
378 - 521 = -143
-143 ÷ 521 = -0.2744721689059501
-0.2744721689059501 x 100 = -27.45%