This visualization shows BMW sales volumes from 2010–2024, aggregated by year and region, with each region mapped to a representative country. It uses a grouped bar chart rendered with D3.js v7 and SVG, where hovering over bars reveals tooltips with precise values. The chart employs d3.rollups for data aggregation, d3.scaleBand for x-positioning, and d3.scaleLinear for the y-axis. Data comes from a CSV file with fields like Model, Year, Region, and Sales_Volume.