I recently did some analysis of the EC2 API. I wanted to look at the API over time so I could remember which API requests were added in each of the 23 separate versions of the API over the past 5 years. The results were kind of interesting and I thought it would be worthwhile to share them here.
The following image shows a graph of the number of requests over time. If you click on the image, you will see a high-res PNG version of the information that lets you zoom in to get much greater detail. The reddish color section of each of the bars in the bar graph actually contain the names of the individual requests added in each version but those are really only readable in the high-res version of the graphic.
Note that this analysis is only looking at the request level. I'm not diving deeper to look at the individual parameters in each requests which, in some cases, have also changed over time. I may do that analysis at some point but it's a huge amount of work and I doubt that I'll find the time.
The raw JSON data behind this can be found in the missingcloud github repo.