221.22% is the change from 311 to 999
Calculation steps:
[( 999 - 311 ) ÷ 311] x 100 = 221.22%
Formula
Percentage change = [(999 - 311) / 311] x 100
Subtract the new number by the original number
999 - 311 = 688
688 ÷ 311 = 2.212218649517685
2.212218649517685 x 100 = 221.22%