| Country | GNI per head ($ PPP) | Under-5 mortality (per 1,000 live births) |
|---|---|---|
| Malawi | 1,600 | 51 |
| Angola | 6,500 | 71 |
| India | 7,200 | 35 |
| Brazil | 15,600 | 14 |
| Poland | 34,100 | 4 |
| Germany | 55,300 | 3 |
| USA | 64,600 | 6 |
| Norway | 72,500 | 2 |
Using Table 1, explain the relationship between GNI per head and the under-5 mortality rate.