21.   Over the past two years, there have been no less than five catastrophic accidents involving Nigerian aircraft.

a. + accident >>共 548
fatal 9.77%
automobile 5.32%
serious 4.68%
nuclear 3.82%
second 2.98%
major 2.77%
industrial 2.54%
tragic 2.05%
similar 1.99%
skiing 1.88%
catastrophic 0.61%
catastrophic + n. >>共 208
illness 4.93%
event 4.63%
failure 4.03%
consequence 3.88%
loss 3.43%
accident 3.13%
injury 3.13%
damage 3.13%
fire 2.99%
flood 2.69%
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