“Good Morning America” (Ida Mae Astute/ABC)

It was one year ago last week that ABC’s morning infotainment show “Good Morning America” overtook NBC’s like-minded “Today” show in overall audience. On Thursday, Nielsen issued ratings for that one-year-anniversary week.

A year earlier, when “GMA” snuffed “Today’s” 852-week streak, it did so with 31,000 more viewers tuned in. One year later, the margin was a much more substantial 660,000 viewers.

“GMA” is up, year to year, by six percent among all viewers, and by 4 percent among 25-to-54 year olds who are the currency of TV news programming ad sales.

“Today,” Meanwhile is down 6 percent in overall viewers and 11 percent in the key age bracket.

In the important age bracket, “GMA’s” win was its 10th consecutive weekly victory — the show’s longest winning streak in the demographic group in nearly two decades.

But the biggest year-to-year leap, percentage-wise, belonged to “CBS This Morning”; it was up 20 percent in overall audience and 5 percent in the age bracket.

Sure, “CBSTM” averaged 3.004 million viewers, putting it laps behind “Today’s” 4.8 million and “GMA’s” 5.5 million. But, the CBS show can boast it has cracked 3 million viewers five times this TV season to date: the week Hurricane Sandy hit, three weeks of the recent February sweep, and last week.