According to the Sturtz and Johnson book (2012), 5/8" marbles were made from 1991-2008; 3/4" marbles were made from 1995-2005, and 1" marbles were made from 1995-2007. Although, "a few experimantal" 3/4" and 1" marbles were made in 1994. Of course, we are talking only about the Classic years here.
This is the best information I could come up with. 🙂