Table 1.

Observed frequencies of the most common clonal complexes per year

Clonal complex	Year											Total
	1971	1972	1973	1974	1975	1978	1979	1980	1993	1994	1996
cc41/44	5	26	11	9	25	8	4	8	31	7	3	137
cc549	1	34	14	2	4	1	1		5	2		64
cc376	7	11	5	17	6	2	2	3		1	1	55
cc22	2	2	5	11	10	2	3	5	3			43
cc92	2		1	3		4			21	5	6	42
cc11									33	4		37
cc174	2	9	6	2	7	1			1	3		31
Others	12	17	22	34	17	12	15	23	63	33	15	263
Unassigned	19	36	31	24	46	16	19	21	61	24	8	305
Total	50	135	95	102	115	46	44	60	218	79	33	977

Complexes with 30 or more members are shown.