-35.7% is the change from 521 to 335
Calculation steps:
[( 335 - 521 ) ÷ 521] x 100 = -35.7%
Formula
Percentage change = [(335 - 521) / 521] x 100
Subtract the new number by the original number
335 - 521 = -186
-186 ÷ 521 = -0.3570057581573896
-0.3570057581573896 x 100 = -35.7%