My guess would be in the 80's, when the 'higher' performance 7-cells were the norm. Ravens, Cruiselites, Comets, Pegasus', those sorts of canopies. When you could skydive and base jump with the same gear. I kind of liken that era to the muscle car era of the 60's and 70's. They didn't go as fast or handle as well as what you can get today, but they were badass and we had a lot of fun with them.
What are the smaller, very high performance canopies being jumped today like for distance? My Cruiselite would get me back from anywhere and I often suspect that my current canopy, a 210 Hornet, is just a knockoff of the Cruiselite but built with ZP. I love being able to fly around and check places out under canopy even after opening at normal 2k. When Chesapeake was open and the winds out of the East I'd open a little high, maybe 3k, over the airport/dz in Chesapeake Oh, fly across the river to Huntington Wv, which is beautiful from the sky, then back.