Question about the Logbook's real code value.

So if we assume FNAF 1 actually is in 1993 and the real code value is actually supposed to tell us when FNAF 3 takes place, doesn't that mean 3 is set in 2017 and FFPS a year or so after? Or could it be what Hyperdroid suggested that Scott can't predict future wages and inflation so he'd just use the ones that he can easily access?