A line chart displays the number of blood donors across ten French election years from 1973 to 2016, using yellow-filled points connected by a thin border. The visualization uses Chart.js 2.x with a canvas renderer, custom white background drawn via the beforeDraw plugin, and hidden legend. Tooltips show values with custom gray styling, while axes display year labels without gridlines on the x-axis and zero-based scaling on the y-axis.