-6.91% is the change from 521 to 485
Calculation steps:
[( 485 - 521 ) ÷ 521] x 100 = -6.91%
Formula
Percentage change = [(485 - 521) / 521] x 100
Subtract the new number by the original number
485 - 521 = -36
-36 ÷ 521 = -0.0690978886756238
-0.0690978886756238 x 100 = -6.91%