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| Centre of encounter | |||||
|---|---|---|---|---|---|
| Federal Capital Territory (%) | Kogi (%) | Nasarawa (%) | Niger (%) | ||
| Year | 2010 | 2 (9.5) | |||
| 2011 | 6 (28.5) | 8 (32.0) | |||
| 2012 | 9 (42.9) | ||||
| 2013 | 4 (19.1) | 6 (26.1) | |||
| 2014 | 2 (22.2) | 5 (21.7) | |||
| 2015 | 6 (66.7) | 4 (17.5) | |||
| 2016 | 1(11.1) | 3 (13.0) | 3 (12.0) | ||
| 2017 | 3 (13.0) | 11 (44.0) | |||
| 2018 | 2 (8.7) | 3 (12.0) | |||
