Thanks for the feedback.
No, not 16 NEW ones in 18 months....16 total. I'm not sure how many are new within the last 18 months, but probably at least 8 or so anyway.
I just got approved for Barclay Arrival Plus and Citi Prestige within the last 3 months, so I might still be eligible for some (though I imagine it is easier with Prestige given the hefty $450 annual premium not waived.)