-37.52% is the change from 821 to 513
Calculation steps:
[( 513 - 821 ) ÷ 821] x 100 = -37.52%
Formula
Percentage change = [(513 - 821) / 821] x 100
Subtract the new number by the original number
513 - 821 = -308
-308 ÷ 821 = -0.3751522533495737
-0.3751522533495737 x 100 = -37.52%