What kind of calls have had an increase??
See, you may sit on (For Example) 85 calls, for 10 years... One year there is a night of freak storm and wind behaviour, making 25 calls in the one night....
Your brigade totals for that year are 110 calls.... Although doesn't necassarilly mean the area is growing etc..
My brigade is down this year, as are quite a few from what some have told me...
The easiest way to tell, is see what calls have increased, and work out why... EG - The freak storm, possibly an additional 20 alarms, maybe 20 MVA's, meaning that you have either more traffic, or more careless drivers.