user: ### NOW ANSWER:
Question: What is the lowest 2013 population estimate of the province with a 23.7 percentage?
Columns: ['Rank', 'Province', 'Population (2011)', 'Percentage', 'Population Estimate (2013)']
Types: ['text', 'text', 'real', 'real', 'real']
Sample row: ['1', 'Gauteng', 12272263.0, 23.7, 12728400.0]
SQL:

assistant: SELECT MIN("Population Estimate (2013)") FROM "Table" WHERE "Percentage" = 23.7;