'85 is my favorite Joe year. Some of the most iconic Joes were released, not to mention the best version of Snake Eyes, great Cobra troops (CGs, Serpents, Eels), the Twins, the 3 main 'Noks, and of course who could forget the vehicles!
After '85 would definitely be '84. Similar to '85 there were some great Joes that year like Recondo and Roadblock and Ripcord to name a few. The Cobras that year were also top shelf stuff! As we saw Zartan, Stormy, and the Baroness. Not to mention we got both the Whale and the Water Mocassin.
Other than those as my big two I'm really fond if '86 and '83. There was a lot of killer stuff in particular around '86, like General Jones said. '87 to me was kind of a blah year but there were some good releases in it. Then there's '88 which in my opinion is one of the most underrated Joe years.
I guess to map it out I'd go with:
85
84
86
83
88
82
87
89
90