I've been preaching since I was fifteen, but I've only been diligent in keeping any sort of record of my preaching for the past few years. The sermon calendaring program I've been writing for myself for several years now (it is a web application written in C# for Microsoft's ASP.NET framework) contains pretty complete records of my Sunday morning preaching since 2004. Sunday evening and Wednesday evening data is spotty before 2007.
The application not only helps me to look forward in scheduling my sermons, but also helps me to look backwards in analysis of what I have been preaching. Here's a bit of number-crunching for you.
There are 1189 chapters in the Bible. I have records of sermons from 285 of those chapters, leaving 904 chapters of the Bible from which I have no record of having preached in my nine years at Farmersville. That's no record of having preached from those chapters at any time during the week. Those 904 chapters constitute (chapter-wise) 76% of the Bible.
I have preached more sermons out of Leviticus 19 than any other chapter of the Bible, according to these records. I preached a Sunday evening series out of that chapter once upon a time. Exodus 20 comes in second (the 10 commandments). On the other hand, a book-by-book analysis shows that the gospels in particular and the New Testament in general get far more preaching attention from me than does the Old Testament. This falls in line with my persuasion that the New Testament ought to get more attention from New Testament Christians than does the Old Testament. Don't twist my words as permission to ignore the Old Testament—I preach from the Old Testament a great deal, but primacy of place must go to the New Testament.
It is possible, preaching from a different chapter at each of three meetings a week, to preach from each chapter of the Bible in as little as seven years and seven months, but I'm not anywhere near on-track for accomplishing that pace (nor do I wish to). Eighty chapters of the Bible have provided more than one sermon for me, and some portions of the Bible merit a bit more attention. For example, the Ten Commandments can easily produce ten sermons from one chapter, while the story of David and Goliath is probably a self-contained sermon.
Lesson learned: I'll not live long enough to preach the entire Bible as it ought to be preached. The task is a lifetime calling.