Table 1.

Number and ratio of bacterial cultures by year

	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998	Total
Corneal cultures	119	156	210	250	246	249	214	231	277	268	2220
Positive cultures	27	29	36	73	41	57	41	42	64	80	490
(% of corneal cultures)	22.7	18.6	17.1	29.2	16.7	22.9	19.2	18.2	23.1	29.9	22.1