The website does include older movies, but is indeed more focused on newer ones. I don't know if that has to do with the volume of annually produced movies or not.
Here's the chart that shows the changing percentages over time for each year.
Red = Fewer than two named women. ('Named' generally includes 'important' characters too, even if they don't explicitly have a name. Often they at least have a name in credits.)
Orange = There are 2+ named women but they never speak to each other.
Yellow = There are 2+ named women and they speak only about a man.
Green = There's at least one instance where 2+ named women speak about something other than a man.
There's a long way to go but at least it's improving over time.
Yeah, sorry, I didn't mean to imply there weren't any old movies. It would be nice if the chart told us, though, the quantity of the sample so far. Still 3900 movies is... pretty small.
However the chart is interesting so far. I think some of those odd shapes will even out with more samples. But if there was really that significant of a focus of story in the ten's, I would be surprised. Maybe it was early-era marketing naivety.