This area chart displays car sales by year up to 2020, with a green filled region beneath a line curve. The visualization loads CSV data from a GitHub gist, parses dates with `d3.timeParse`, and uses `d3.scaleTime` for the x-axis and `d3.scaleLinear` for the y-axis. The line and area are generated with `d3.line` and `d3.area` using `curveBasis`, rendered as SVG paths, with axes created via `d3.axisBottom` and `d3.axisLeft`.