This area chart shows the number of car listings per year in a USA cars dataset, revealing trends in vehicle availability over time. The visualization uses a monotone curve to connect yearly counts, with a steelblue fill beneath the line. The code imports `csv`, `scaleLinear`, `area`, `curveMonotoneX`, and `group` from D3 v6 to load the data, aggregate counts by year, and render the chart as an SVG. Axes and labels are created via `axisBottom` and `axisLeft`, with the dataset sourced from a raw GitHub URL.