Eh, you are looking at generations rather than years. Ocarina 3D was released before Skyward Sword. Also, you forgot Four Swords Anniversary Edition -- as a DSiWare game, it counts as a part of the DS generation. So from 2006 to 2011 (6 years) there were four new games and two remakes. No Zelda released in 2012. The period from 2013-2018 so far has two new games and two remakes, and we're only halfway through.
But I do agree there have been too many remakes lately.








