This line chart visualizes monthly real imported crude oil prices from 1974 onward, using data from the U.S. Energy Information Administration. The line is drawn in steelblue, with a hover interaction that reveals a focus circle and crosshair lines to inspect exact values. The chart is annotated using the d3-annotation library, with pink callouts highlighting notable price points. The y-axis displays the real price in dollars, while the x-axis shows time. A vertical dashed line marks a specific date of interest, and the chart includes hover-based tooltips for precise data reading.