This multi-series chart displays both the total registered vehicle counts and the corresponding survey years for ten countries. Animated blue bars represent vehicle registrations on the left axis, while a red Catmull-Rom smoothed line overlays the year on the right axis. The visualization uses D3 v7 with SVG, featuring a staggered drawing effect via stroke-dashoffset. Data is loaded from a CSV file, with gridlines and dual axes aiding comparison.