DataSet 5
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Hitachi Software tracks the number of system failures detected
at customer sites. Filed Failure Ratio (FFR) is the number 
of system failures per month per thousand systems [Onom93, Onom95].

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FFR	Year
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1050	1981
400	1982
450	1983
200	1984
100	1985
100	1986
75	1987
55	1988
45	1989
35	1990
30	1991
27	1992
21	1993
19	1994