used to be 021, but I think it was the mid-to-late 90's that they switched to 151. we used to do a significant amount of campus printed graphics, hence the random knowledge. If you look back at some of the historic samples, it's changed subtly a bunch of times. seems to loosely follow cultural trends. Interesting subtext is the Texas color switch -- still unclear to me if this was due to legal/licensing pressure (as I heard anecdotally) related to the interlocking orange U and T or if, as the folks in Austin would have you believe, they decided to change to fugly brorange on their own.