This area chart shows the average electric vehicle range by model year from 2015 to 2020, with a light blue filled region and an overlaid blue line tracing the upward trend. The visualization aggregates raw per-year data points into yearly averages using `d3.rollup` with `d3.mean`, then renders the result as an SVG path via `d3.area` and `d3.line`. Axes are generated with `d3.axisBottom` and `d3.axisLeft`, while linear scales (`d3.scaleLinear`) map the data domain to pixel coordinates within a fixed viewBox.