Modifying the list to what I know and liked.
The 1960's
The Flintstones, The Jetsons, Scooby Doo, Where are You!, The Pink Panther Show.
Score: 04
The 1970's
...Wacky Races?
Score: 01, You listed off mostly crap from Hanna-Barbera cartoons, which were extensive but not great quality, IMO.
The 1980's
Teenage Mutant Ninja Turtles, Ducktales
Score: 02, Although I was aware of some of these cartoons, I wasn't alive when they aired originally.
The 1990's
The Simpsons(technically 80's), Animaniacs, Batman: The Animated Series, Freakazoid!, Sailor Moon, Powerpuff Girls, Dexter's Laboratory, Ed, Edd n Eddy, Johnny Bravo, Arthur, South Park, Darkwing Duck, Futurama, Rugrats, Hey Arnold!.
Score: 15, But some of the ones I don't remember that well, like Sailor Moon, or my opinion may be a bit soured now but I still liked them once (like the Powerpuff Girls).
The 2000's
Samurai Jack, Megas XLR, Avatar: The Last Airbender, Justice League, Foster's Home for Imaginary Friends, Spongebob Squarepants(technically 90's), Teen Titans, Venture Bros., The Boondocks, The Fairly OddParents, Kim Possible, Danny Phantom, Ben 10.
Score: 13, Again, there are some that I left on here that I might not like now but did like at one point, like Kim Possible or Samurai Jack. And sorry, I haven't seen Clone High, but wasn't that only like four episodes?
The 2010's
Adventure Time, The Legend of Korra, My Little Pony: Friendship Is Magic, Young Justice, The Avengers: Earth's Mightiest Heroes
Score: 05, but I don't think it's fair to judge this decade against the rest yet, just because it's only two years old so far (maybe three, depends on how you count decades). Still, with stuff like this right out the gate (especially Adventure Time and hopefully a version of Legend of Korra that doesn't end in a trainwreck of an ending), I'm looking forward to it.
So, on scores alone, I'd give it to the 90s, but I'd probably have to recompare that against the 2Ks to be fair. What I like now might not be what I liked when I was eight.
On the other hand, Animaniacs would most likely be all the persuasion needed.
