-97.71% is the change from 919 to 21
Calculation steps:
[( 21 - 919 ) ÷ 919] x 100 = -97.71%
Formula
Percentage change = [(21 - 919) / 919] x 100
Subtract the new number by the original number
21 - 919 = -898
-898 ÷ 919 = -0.9771490750816104
-0.9771490750816104 x 100 = -97.71%