Are there any known gaps in the data?

Yes, a few. KEA publishes ranks only, so we have no marks-based cutoffs for any year. Some cells are blank because no seat was allotted (or the college did not participate) in that category, and older years occasionally include one-off codes such as SNQ (supernumerary quota), JK and DK that appear in only some years. For 2016 and 2017 the last available file is the extended round rather than a labelled final round.