A bar chart displays the running total of a dataset from 1949 to 2019, with each year’s cumulative value shown as a horizontal steelblue bar. The chart uses d3.csv to load the data, then d3.scaleLinear for the x-axis and d3.scaleBand for the y-axis. Axes are rendered with d3.axisLeft and d3.axisBottom, while the x-axis labels are formatted with d3.format using a '.3s' suffix.