Study the table below, which shows the Gross National Income (GNI) per capita (PPP, US$) for Nigeria in 2000 and 2015.
| Year | GNI per capita (PPP, US$) |
|---|---|
| 2000 | 1,600 |
| 2015 | 5,600 |
Calculate the percentage increase in Nigeria's GNI per capita between 2000 and 2015.
71.4%71.4\%71.4%
150%150\%150%
250%250\%250%
350%350\%350%