-99.62% is the change from 521 to 2
Calculation steps:
[( 2 - 521 ) ÷ 521] x 100 = -99.62%
Formula
Percentage change = [(2 - 521) / 521] x 100
Subtract the new number by the original number
2 - 521 = -519
-519 ÷ 521 = -0.9961612284069098
-0.9961612284069098 x 100 = -99.62%