Civil Engineering Reference
In-Depth Information
1974
25.7
1975
32.9
1976
28.3
1977
27.3
1978
28.3
1979
28.3
1980
29.3
1981
27.8
1982
27.8
1983
30.9
1984
26.7
1985
30.3
1986
28.3
1987
30.3
1988
34.0
1989
28.8
1990
30.3
1991
27.3
1992
27.8
1993
28.8
1994
30.9
1995
26.2
1996
25.7
1997
24.7
1998
42.2
Mean
29.27
SD
3.196
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