This bubble chart displays average salary by year for Stamen employees across multiple states, with circle size encoding a rate value and color distinguishing states. The visualization uses D3 v4 with SVG rendering, employing `d3.scaleTime` for the x-axis, `d3.scaleLinear` for the y-axis, and `d3.scaleOrdinal` for state colors. Axes are generated with `d3.axisBottom` and `d3.axisLeft`, and circles include a title tooltip for data inspection. Data comes from a CSV file loaded via `d3.csv`.