-9.79% is the change from 521 to 470
Calculation steps:
[( 470 - 521 ) ÷ 521] x 100 = -9.79%
Formula
Percentage change = [(470 - 521) / 521] x 100
Subtract the new number by the original number
470 - 521 = -51
-51 ÷ 521 = -0.09788867562380038
-0.09788867562380038 x 100 = -9.79%