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I have the same year. Mine displays anywhere from 13.4 to 14.0 depending on the situation. Meaning, if it is just started, then the voltage is a little lower, as I drive, it starts going up. 14.0 is the peak I have seen.
In the winter mine reads 13.7-14.0
As car warms up the reading drops. The number that appears to be the most common is 13.7-13.6.
The A/C really saps voltage and when combined with summer heat down here can get the reading down to the low 13's. High 12's occassionally show up while waiting at stop lights with everything running.