With reference to Figure 1, explain one reason why the Labor Force Survey (ILO) measure of unemployment and the Claimant Count measure of unemployment differ.

| Year | ILO Measure (Millions) | Claimant Count (Millions) |
|---|---|---|
| 2018 | 2.10 | 1.35 |
| 2019 | 1.95 | 1.40 |
| 2020 | 2.80 | 2.15 |
| 2021 | 3.10 | 2.45 |
| 2022 | 2.40 | 1.80 |
| 2023 | 1.85 | 1.20 |