A simple bar diagram shows one bar per year with height proportional to production; comparing consecutive bars' heights gives the year-on-year change directly.

Differences: 2020: +30, 2021: −50, 2022: +80, 2023: +20. The largest increase is +80 in 2022.

Step 1 — Draw the bar diagram. Mark the five years on the X-axis and production (units) on the Y-axis; draw five equal-width bars, one per year, each starting from a zero baseline.

Step 2 — Compute the year-on-year changes.

• 2020 vs 2019: $150-120=30$
• 2021 vs 2020: $100-150=-50$
• 2022 vs 2021: $180-100=80$
• 2023 vs 2022: $200-180=20$

Step 3 — Identify the largest increase. Comparing $+30, -50, +80, +20$, the largest positive change is $+80$, occurring in 2022.

Independent check. Re-computing directly from the bar heights (rather than the running differences): the biggest single jump between two adjacent bars is visibly between the 2021 bar (100) and the 2022 bar (180), a rise of 80 units — matching the arithmetic.

Confusing 'the year with the highest production' (2023, at 200 units) with 'the year with the biggest increase' (2022, a rise of 80) is the most common slip in this type of question — always compute the year-on-year differences separately rather than just reading off the tallest bar.