This area chart visualizes the change in a numeric value over a sequence of years, with the area beneath the line filled in steel blue. The chart is rendered as an SVG and is built using D3.js v6’s modular API, including `d3.csv` to load the data, `d3.scaleLinear` for both axes, and `d3.area` to generate the area path. Axis ticks are added via `d3.axisBottom` and `d3.axisLeft`. Data is fetched from a remote CSV file hosted on GitHub.