No matter who you are, you need an annual report to document what you've done the past year. Whether it's posted online for you citizens to see, or handed out to the decision makers in your governing boy is immaterial. What is important is that you have something that at least documents how many calls you've answered and how many you have dispatched. Past that, the canvas is blank for you to showcase the successes - and issues - from the past 365 days.
This sample is from an agency I managed. You can pick the facts that are important to you, and publish them in any format. All you need is some form of desktop publisher, and the commitment to get it done!