The catalog of charts and the catalog of tools were two very different data sets. Charts are a mathematical phenomenon that is not too susceptible to trends, but tools are. So while some tools are wildly popular and others are barely known, chart popularity is more evenly distributed. That’s why the two visualizations look so different as far as search interest data.
As a product manager, I’m always in need for visualization and story telling. This is a great reference for me to help me evaluate which chart is best for delivering the story of the data.