This chart shows the cumulative running total of Lego sets released each year from 1949 to 2019, based on Rebrickable data. The visualization uses vertical violet bars to represent the growing count over time, with a time-scaled x-axis and a linear y-axis. The code employs d3.dsv to load the CSV, d3.scaleTime and d3.scaleLinear for the axes, and SVG rectangles for the bars, which are flipped vertically using a scale transform. Axis labels and a title are added via d3 selections.