Description
Data frame giving the number of damage incidents and aggregate
months of service by ship type, year of construction, and period of operation.Format
type-
type:
"A" to "E".
year-
year of construction: 1960--64, 65--69, 70--74, 75--79
(coded as
"60", "65", "70", "75").
period-
period of operation : 1960--74, 75--79.
service-
aggregate months of service.
incidents-
number of damage incidents.