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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