Create a sequence of three plots that build a visual narrative about customer satisfaction trends over time, using the provided data. Each plot should reveal new insights and use visual cues effectively.

• Create a plot showing customer satisfaction scores for the first three years (2016–2018);
• Add a second plot that extends the timeline to 2020 and uses color to highlight improving satisfaction;
• Build a final plot (2016–2023) that includes an annotation for the key event in 2021 and avoids visual clutter;
• Ensure each plot has clear titles and axis labels that guide the viewer from introduction to conclusion.