217.31% is the change from 312 to 990
Calculation steps:
[( 990 - 312 ) ÷ 312] x 100 = 217.31%
Formula
Percentage change = [(990 - 312) / 312] x 100
Subtract the new number by the original number
990 - 312 = 678
678 ÷ 312 = 2.173076923076923
2.173076923076923 x 100 = 217.31%