  
<prompt> Trends in polygyny
 Percentage of married women age 15-49 in a polygynous union 
 [["1990 NDHS", 41], ["2003 NDHS", 36], ["2008 NDHS", 33], ["2013 NDHS", 33], ["2018 NDHS", 31]] 
 <response> Thirty-one percent of currently married women are in a polygynous union, as compared with 41% in 1990 and 33% in 2013.  