This bar chart shows the total number of rockets launched each year, with bars colored by the company’s country of origin. Built with Vega-Lite and D3, it uses the `groupby` transform to aggregate yearly counts by country and encodes the result with `vl.markBar()`, `vl.x().fieldN('Year')`, `vl.y().fieldQ('Count')`, and a color field for origin. The tooltip displays the count and country. Data comes from a Kaggle CSV loaded via D3’s `csv` function, rendered as an SVG with a custom dark theme.