I can tell you that I started in 1994 as a loans officer at a credit union. The most we could discount a five-year rate was 0.25%, and that was for our absolute best client. Since brokers in the monoline industry have come along we've grown that. Now a normal discount is 2% off of a five-year rate. It could easily go back the other way when it's back to just the big banks.
On February 1st, 2017. See this statement in context.