Study Figure 2, which shows the percentage of total employment in agriculture in three high-income countries between 1980 and 2020.

| Year | United Kingdom (%) | Italy (%) | Japan (%) |
|---|---|---|---|
| 1980 | 2.6 | 12.1 | 10.4 |
| 2000 | 1.5 | 6.1 | 5.1 |
| 2020 | 1.1 | 3.8 | 3.2 |
Suggest one reason for the overall trend shown in Figure 2.