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Table 4 Maize yield Z-score values for the four ASAL districts in lower eastern Kenya. Mwingi County was split from Kitui County in 1993 while Makueni County was split from Machakos County in 1992

From: Effects of climate variability on maize yield in the arid and semi arid lands of lower eastern Kenya

Year Machakos Kitui Mwingi Makueni
1979 0.786356 0.575322   
1980 1.235854 0.817523   
1981 0.521948 0.380608   
1982 1.235849 0.817513   
1983 0.521948 0.380608   
1984 −0.18929 0.054856   
1985 −0.90051 0.054856   
1986 0.142575 −0.61594   
1987 0.845923 −1.32809   
1988 1.182972 1.104854   
1989 1.625137 1.694813   
1990 0.756231 0.229131   
1991 1.711783 −1.23646   
1992 0.331038 0.161554   0.77773
1993 0.521946 0.547139 0.419806 2.241552
1994 −1.19673 −0.38961 0.597489 0.122868
1995 −0.42994 −0.4417 0.162405 −0.67619
1996 −1.29864 −0.70081 −0.57526 −1.27456
1997 −0.54823 −0.49542 −0.01675 1.441978
1998 −1.39109 −0.98219 −0.63601 −0.93779
1999 −0.77473 −0.4652 −0.49038 −0.56105
2000 −0.6603 −0.5802 −0.37847 0.472081
2001 −0.5986 −1.25224 −0.20612 0.111183
2002 0.184625 0.345585 0.515331 0.010476
2003 −0.76637 −0.73358 0.190283 −0.92497
2004 −1.16023 −0.4652 −0.47653 −0.47019
2005 −1.19849 −1.04162 −0.77353 −1.4976
2006 −0.17986 −0.86408 −0.44848 −0.79932
2007 −1.49532 −0.39319 0.195344 0.138148
2008 −0.41089 0.441494 0.388534 0.652542
2009 0.67342 1.276293 0.581184 1.166954