Yes, the date at the top is correct. Japan's Dragon Ball Z, the follow-up to the original Dragon Ball anime, made its debut in 1989, but it was several years before it was imported to the US, where it has maintained a steady presence in recent years. Cartoon Network recently reacquired the series for its [adult swim] lineup, according to reports.
During its first run on Cartoon Network, Dragon Ball Z aired as part of the daytime Toonami block. It's since aired on CW & Nicktoons before returning to CN. I didn't follow the show all that much, so there won't be a rating.
Here's the intro that aired on CN: