One of the larger blank "No Data" areas is Australia (total pop. ~ 24 million (ish)) which is a bit slack on the Pew side given the ease of getting accurate data for the country:

    In June 2022, there were 7.3 million families, an increase of 1 million (15.3%) since June 2012. Of these:

    * 6.2 million (84.2%) were couple families

    * 1.0 million (14.2%) were one parent families with 79.9% of these being single mothers

    * 118,000 (1.6%) were classified as 'other families', where at least two people were related in some way other than as a couple or as a parent and child (such as adult-age siblings) 

https://www.abs.gov.au/statistics/labour/employment-and-unem...