Incident Cause	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011
Unknown	10,552	11,800	10,266	10,314	10,078	9,956	10,209	10,849	10,576	9,611	11,747	10,708
Equipment Failure	8,383	8,429	8,341	9,132	10,895	11,533	11,463	8,806	8,234	7,084	6,635	6,326
Other	6,428	7,204	7,457	6,531	3,907	3,865	3,858	3,860	3,942	3,923	4,420	3,955
Operator Error	3,459	2,885	2,305	2,889	2,997	2,684	2,908	2,885	3,022	2,331	2,128	1,861
Drills	0	0	0	0	0	0	0	0	0	0	1,944	2,380
Transport Accident	609	713	563	631	1,050	1,152	1,103	1,361	1,387	1,162	1,125	1,025
Dumping	1,523	1,494	1,265	960	806	757	863	1,004	935	1,067	1,158	872
Security Breach	0	0	0	6	264	761	924	952	907	765	755	807
Suspicious Activity	0	0	0	25	726	945	833	948	1,287	852	1,101	991
Vessel Sinking	0	0	0	0	366	655	802	835	965	862	951	952
Natural Phenomenon	472	716	497	711	685	575	804	708	726	511	711	571
Derailment	0	0	0	0	222	342	461	518	597	349	488	466
Trespasser	0	0	0	0	0	0	0	0	0	0	398	752
Hurricane	0	0	0	0	107	580	430	322	631	853	261	451
Criminal Intent	207	170	141	148	224	151	154	147	154	99	116	121
Over Pressuring	0	0	0	0	260	209	149	119	106	119	109	103
Explosion	21	68	46	48	47	66	91	110	124	92	80	64
Suicide	66	34	34	47	82	118	127	98	94	65	21	24
Bomb Threat	0	0	0	0	0	0	0	72	68	61	46	45
Flood	0	0	0	0	35	28	9	45	50	27	63	101
Terrorism	46	54	358	44	72	95	91	25	19	3	2	2
Tornado	0	0	0	0	5	6	17	16	36	6	17	47
Earthquake	0	4	4	2	2	9	6	7	18	3	9	2
Aircraft Diversion	0	0	0	0	4	4	0	2	3	2	1	1
Disorderly Passenger	0	0	0	3	1	0	1	1	1	0	0	0
Cyber Attack	0	0	0	0	1	0	0	0	0	0	0	1
Hijacking	0	0	0	1	0	0	0	0	0	0	0	1