Household size is evolving differently

Country (Region)	1990	1992	2015	Change
Nigeria (Sub-Saharan Africa)	5.39		4.90	-9%
India (South Asia)		5.70	4.57	-20%

Source: United Nations - Department of Economic and Social Affairs (UN-DESA)
Note: The pace of reduction in household size is slower in Sub-Saharan Africa.
The pace of reduction in household size is faster in South Asia.
Average household size was higher in South Asia in the early 1990s. 
Average household size is more recently higher in Sub-Saharan Africa.