I used Schreier 2-row in the nineties. Schreier 2-row was a big step up from Briess 2-row, which is bottom of the barrel in my humble opinion.
The conversions drop off around 2000 because I believe that that was around the time when the commodities giant Cargill took control of the company. I know that Cargill purchased Shreier's controlling interest in Prairie Malt in Canada in 1998.