Study Figure 4, which shows the change in contribution of different economic sectors to the Gross Domestic Product (GDP) of Vietnam in 2000 and 2018.
Figure 4
| Year | Primary (%) | Secondary (%) | Tertiary (%) |
|---|---|---|---|
| 2000 | 24 | 37 | 39 |
| 2018 | 15 | 34 | 51 |
Which sector made the smallest contribution to GDP in 2018?
Primary
Secondary
Tertiary
Quaternary
