217.63% is the change from 312 to 991
Calculation steps:
[( 991 - 312 ) ÷ 312] x 100 = 217.63%
Formula
Percentage change = [(991 - 312) / 312] x 100
Subtract the new number by the original number
991 - 312 = 679
679 ÷ 312 = 2.176282051282051
2.176282051282051 x 100 = 217.63%