Year | Water surface area (Km2) | Water surface area (%) |
1973 | 16,157.4 | 100 |
1987 | 14,95.99 | 9.26 |
2001 | 3712.74 | 22.98 |
2013 | 2686.5 | 16.62 |
2017 | 1831.44 | 11.33 |