The participate rate in year $\"\"$ is $\"\"$ .

Number of people in the labor force in year $\"\"$ is $\"\"$ .

Civilian population in year $\"\"$ is $\"\"$ .

From the definition, the participate rate in year $\"\"$ ( $\"\"$ ) is equals to the number of people in the labor force in year $\"\"$ ( $\"\"$ ) divided by the civilian population in year $\"\"$ ( $\"\"$ ).

Thus, $\"\"$ .

The function is $\"\"$ .