The table below shows the estimated population growth of Lagos, Nigeria, a major city in a newly emerging economy, between 1990 and 2025.
Population of Lagos (1990–2025)
| Year | Population (millions) |
|---|---|
| 1990 | 4.7 |
| 1995 | 6.0 |
| 2000 | 7.5 |
| 2005 | 9.3 |
| 2010 | 11.2 |
| 2015 | 13.5 |
| 2020 | 15.6 |
| 2025 | 17.8 |
Identify the period when the population of Lagos increased by exactly 1.8 million1.8\text{ million}1.8 million.
1995 to 2000
2000 to 2005
2005 to 2010
2015 to 2020
