user: Question: What was the sum total of the region after 1976 when Mareeba had population was more than 18212?
Columns: ['Year', 'Population (Region total)', 'Population (Mareeba)', 'Population (Atherton)', 'Population (Herberton)', 'Population (Eacham)']
Types: ['real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1933.0, 19386.0, 8248.0, 3962.0, 2852.0, 4324.0]
SQL:

assistant: SELECT SUM("Population (Region total)") FROM "Table" WHERE "Year" > 1976.0 AND "Population (Mareeba)" > 18212.0;