This area chart visualizes population change in China over time, highlighting the overall upward trend in population numbers. The visualization loads data from a CSV file, filters it to only China, and maps years to the x-axis while population values are plotted on the y-axis. Built with d3.v7, the chart uses `d3.scaleBand` and `d3.scaleLinear` for axes, and renders the populated area as a filled SVG path using `d3.area`. The chart includes rotated x-axis labels and axis titles for clarity.