The amount of bourbon produced by distillers in the Commonwealth has topped a million barrels for the first time in nearly 40 years. The Kentucky Distillers' Association says 1,007,703 barrels were filled in 2012. The last time totals went over a million was in 1973. The group says bourbon production is up more than 120 percent since 1999. The distillers' association promotes and lobbies on behalf of the bourbon industry.