Typically, 15–20 theses are produced per year. The high number of PhD theses in 2016 is due to the expansion of Nikhef that year with the Van Swinderen Institute (VSI) of the University of Groningen. The PhD duration in 2018 has a median of 55.4 months. Note that there is a 3-4 months’ delay between finishing the thesis and the thesis defense.