This bar chart shows the cumulative number of Rebrickable Lego sets released each year from 1949 to 2019, with the running total rising steadily from 5 to nearly 15,000. The visualization uses D3 v5’s `scaleTime` for the x-axis (with ticks every three years) and `scaleLinear` for the y-axis, rendering steelblue rectangles via SVG. Data is loaded from a CSV using `dsv`, and the chart includes a title and author credit.