-31.5% is the change from 819 to 561
Calculation steps:
[( 561 - 819 ) ÷ 819] x 100 = -31.5%
Formula
Percentage change = [(561 - 819) / 819] x 100
Subtract the new number by the original number
561 - 819 = -258
-258 ÷ 819 = -0.315018315018315
-0.315018315018315 x 100 = -31.5%