user: Question: How many measurements of the Czech Republic's population density are recorded in this table?
Columns: ['Member State', 'Population in thousands', 'Population % of EU', 'Area km 2', 'Area % of EU', 'Pop. density People/km 2']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['EU', '502,519.9', '100', 4324782.0, '100', '116.0']
SQL:

assistant: SELECT COUNT("Pop. density People/km 2") FROM "Table" WHERE "Member State" = 'Czech Republic';