-1.28% is the change from 312 to 308
Calculation steps:
[( 308 - 312 ) ÷ 312] x 100 = -1.28%
Formula
Percentage change = [(308 - 312) / 312] x 100
Subtract the new number by the original number
308 - 312 = -4
-4 ÷ 312 = -0.01282051282051282
-0.01282051282051282 x 100 = -1.28%