The calculations show the venues injected £65m worth of business tourism into the local economy during the 2008/2009 financial year – £8m less than the £73m generated in 2007/2008.
The overall economic benefit of Bournemouth's business tourism was also hit, dropping £12.6m, from £127.6m in 2007/2008 to £115m in 2008/2009.
"It is important to put our figures into perspective; it's a small drop, which when you look at the economy is by no means worrying," said BIC head of conferences, exhibitions and events Clive Tyers.
"Although they represent a fall in the amount of business tourism we attracted compared with the previous financial year, this was a result of external factors.
"As the green shoots start to appear, we expect these figures to return to the level they were and higher."
To add your own comment and let us know your thoughts.