bmi regional route churn slowing down but adding new routes from Birmingham
The above link relates to an article published in February about bmi regional on a well-known aviation analyst's website.
It confirms that in the years 2012-2016 the airline's annual load factors were in the range 53.7% to 54.6% except for 2013 when it dropped to 49.1%. June and July enjoy the highest loads.
As B_T points out, fares are usually high.