This bar chart displays the cumulative running total of LEGO sets released each year from 1949 to 2019, using data from Rebrickable. The chart encodes years on the x-axis and the running total (divided by 100 in the data preprocessing) on the y-axis, with steel-blue bars representing each year’s cumulative count. The visualization is built with D3 v5, using `csv()` to load the data, `scaleBand` and `scaleLinear` for scales, and `axisBottom` and `axisLeft` for axes. The title and axis labels are added manually via SVG text elements.