This diverging bar chart visualizes the percentage-point change in smoking rates between 2011 and 2012 across five countries, with positive differences extending rightward in blue and negative differences leftward in red from a central zero axis. The chart uses D3.js v7 to load the CSV dataset, compute the absolute maximum difference for symmetric axis scaling, and render SVG rectangles with horizontal orientation. A d3-scale linear color scale maps negative to positive values through light grey, while the d3-legend plugin adds a horizontal color legend. Hovering highlights bars in orange, and the chart includes labeled axes for both percentage difference and country names.