This line chart visualizes customer counts per year from 2000 to 2010, with the data loaded from a CSV file using `d3.csv`. The SVG visualization uses `d3.scaleBand` for the x-axis and `d3.scaleLinear` for the y-axis, rendering the trend as a thick steel-blue stroke. Axes are generated with `d3.axisBottom` and `d3.axisLeft`, while the line itself is built via the `d3.line` generator. The chart includes labeled axes for "Year" and "customers," following the reusable chart pattern from Bostock’s “Towards Reusable Charts.”