Antwerp Airport is always going to be a niche route. It's supported London flights for years as there is enough VFR catchment in the Flanders region plus the port/diamond/petro chemical business traffic. Other routes have always struggled and been pulled after a season or so. MAN was operated by VLM/CityJet for a while until they pulled out when they re-focused on LCY only. ANR has a very short runway and tentative plans to extend it have met with ongoing opposition so it will only support turbo props or small jets such as the E135/E145. Perhaps that's why BMIR picked it up? BRU is only 40 mins away and now with direct trains to Antwerp Centraal so it really isn't a surprise that MAN/ANR had such low numbers.