-78.88% is the change from 999 to 211
Calculation steps:
[( 211 - 999 ) ÷ 999] x 100 = -78.88%
Formula
Percentage change = [(211 - 999) / 999] x 100
Subtract the new number by the original number
211 - 999 = -788
-788 ÷ 999 = -0.7887887887887888
-0.7887887887887888 x 100 = -78.88%