Year range Speed Buggy

Currently, the year range for Speed Buggy (https://www.imdb.com/title/tt0069636/reference/) is listed as 1973-1983. 

However, as you can see, all episodes on IMDb are from 1973: https://www.imdb.com/title/tt0069636/episodes/?year=1973 

Toonopedia also talks about one season consisting of 16 episodes: https://toonopedia.com/speedbug.htm

Cartoon Network also stated there are but 16 episodes: https://web.archive.org/web/20010429193959/http://www.cartoonnetwork.com/doc/speedbuggy/ 

Can a staffer look into this and correct the year range please?