user: Question: Natural change of 42 689 has which lowest Crude birth rate (per 1000)?
Columns: ['Average population (x 1000)', 'Live births', 'Deaths', 'Natural change', 'Crude birth rate (per 1000)', 'Crude death rate (per 1000)', 'Natural change (per 1000)']
Types: ['text', 'text', 'text', 'text', 'real', 'real', 'real']
Sample row: ['5 970', '163 297', '76 851', '86 446', 27.4, 12.9, 14.5]
SQL:

assistant: SELECT MIN("Crude birth rate (per 1000)") FROM "Table" WHERE "Natural change" = '42 689';