-78.08% is the change from 990 to 217
Calculation steps:
[( 217 - 990 ) ÷ 990] x 100 = -78.08%
Formula
Percentage change = [(217 - 990) / 990] x 100
Subtract the new number by the original number
217 - 990 = -773
-773 ÷ 990 = -0.7808080808080808
-0.7808080808080808 x 100 = -78.08%