-62.03% is the change from 819 to 311
Calculation steps:
[( 311 - 819 ) ÷ 819] x 100 = -62.03%
Formula
Percentage change = [(311 - 819) / 819] x 100
Subtract the new number by the original number
311 - 819 = -508
-508 ÷ 819 = -0.6202686202686203
-0.6202686202686203 x 100 = -62.03%