This example shows an area chart of average depression percentages across World Bank income groups (Low, Lower-Middle, Upper-Middle, High), using data from a CSV file loaded via d3.csv. The chart renders an SVG with a light blue filled area overlaid with a dark blue line and circles marking each aggregated point. It uses d3.scalePoint for the x-axis, d3.scaleLinear for the y-axis, and d3.area alongside d3.line generators. Axis labels and a title are added via SVG text elements.