Larry,
This is our group's 20th anniversary hunt in Huron SD (eastern SD). My recollection is that our early seasons had much more plentiful birds than even the much talked about last season. The daily takes back then were 'limits' for the entire group of 30+ hunters nearly every day. Last year, while some shot limits, others were skunked or maybe had a bird or two in our group. Overall average takes were about 2 1/4 birds per day for the 3 day hunt, with many of the same guys taking most of the birds. (y'ever try to shoot a 1/4 of a bird?)

If you know of some historical data, I'd be interested in the reading.