Soundwave on 16 August 2019
Probably 1993 ... they released Star Fox which was a big deal, but the only other major first party game for the rest of the year was Super Mario All-Stars which is a compilation of older games. Of course, back in those days it didn't matter as much because Nintendo had such great third party support.
I actually didn't think 2015 was that bad at all ... Splatoon (biggest new Nintendo IP in ages), Mario Maker, Xenoblade X, Yoshi's Wooly World.
2016 was bad but it also contributed to 2017 being so full.
