Table 1.

Results of samples used in the analysis

Country						Total
Ghana	1993	1998	2003	2008	2014
Samples	583	656	966	2023	2130	6358
Egypt	1992	1995	2000	2005	2014
Samples	3090	3779	4279	4595	5842	21 555
Kenya	1993	1998	2003	2008	2014
Samples	623	500	1398	1342	6369	10 232
Zambia	1992	1996	2001	2007	2013
Samples	2329	2099	1591	1867	4636	12 522
Burkina Faso	1993	1998	2003	2010	–
Samples	1774	873	3136	3006	–	8789
Benin	1996	2001	2006	2011	–
Samples	702	1403	5097	4480	–	11 682
Mali	1995	2001	2006	2011	–
Samples	1630	2395	3673	2323	–	10 021
Malawi	1992	2000	2004	2010	–
Samples	999	1864	1022	1801	–	5686
Niger	1992	1998	2006	2012	–
Samples	2253	1069	2267	2453	–	8042
Rwanda	2000	2005	2010	2014	–
Samples	1528	1524	1112	1604	–	5768
Tanzania	1991	1996	2004	2009	–
Samples	1128	1247	1336	1404	–	5115
Uganda	1995	2000	2006	2011	–
Samples	1462	1510	826	1539	–	4593
Zimbabwe	1994	1999	2005	2010	–
Samples	508	1685	1298	1500	–	4991
Senegal	1993	2005	2010	–	–
Samples	1683	3180	3373	–	–	8236
Ivory Coast	1994	1998	2011	–	–
Samples	1470	1040	2344	–	–	4854
Cameroon	1998	2004	2011	–	–
Samples	838	2819	4161	–	–	7818
Ethiopia	2000	2005	2011	–	–
Samples	1550	1299	1817	–	–	4666
Guinea	1999	2005	2012	–	–
Samples	1415	1263	1818	–	–	4496
Lesotho	2004	2009	2014	–	–
Samples	640	648	761	–	–	2049
Madagascar	1997	2003	2008	–	–
Samples	722	2708	2079	–	–	5509
Mozambique	1997	2003	2011	–	–
Samples	949	3320	3308	–	–	7577
Nigeria	2003	2008	2013	–	–
Samples	1831	6659	8976	–	–	17 466
Namibia	1992	2006	2013	–	–
Samples	1090	1854	2142	–	–	5086
Chad	1996	2004	2014	–	–
Samples	2443	2112	3396	–	–	7951
Total sample						191 836