Williston, N.D. - At its peak, the Williston Basin Petroleum Conference drew about 1,500 people.
This year, attendance was a little less at about 600 people.
Officials say that numbers are lower when the conference is in Saskatchewan.
In addition, this year didn't have a keynote speaker from a major presidential candidate like last year.
But officials still are pleased with this year's turnout.
"When this conference first started in 1992, we only had 50 people that came by invite only. And to have over 600 people come is phenomenal. So we're really happy," said Dan Kohlruss, Co-Chair, Williston Basin Petroleum Conference.
Kohlruss says they're planning future conferences to have about a thousand people.
The 2018 Williston Basin Petroleum Conference will be in Bismarck at the of May.