The above diagram illustrates historical edit patterns among amenity tags on the OpenStreetMap. See this blog post.
This work is based on data extracted from the OpenStreetMap project (openstreetmap.org), © OpenStreetMap contributors. The OpenStreetMap data is available under the Open Database License. The source code for this website is available under the MIT License on GitHub. The data is from the 7.12.2015 OpenStreetMap export.
Please note that this work is still somewhat experimental. Any comments, feedback and corrections are welcome.