Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Built | Listed | Location | County |
| --- | --- | --- | --- | --- |
| Clarkson Bridge | 1904 | 1974-06-25 | Cullman | Cullman |
| Coldwater Creek Covered Bridge | ca.1845 | 1973-04-11 | Coldwater | Calhoun |
| Easley Covered Bridge | ca.1927 | 1981-08-20 | Oneonta | Blount |
| Five Mile Creek Bridge | ca.1911 | 1973-02-28 | McCalla | Jefferson |
| Half-Chance Bridge | ca.1880 | 1972-09-14 | Dayton | Marengo |
| Horton Mill Covered Bridge | 1934, 1935 | 1970-12-29 | Oneonta | Blount |
| Kymulga Mill and Covered Bridge | ca.1860, ca.1864 | 1976-10-29 | Childersburg | Talladega |
| Nectar Covered Bridge | 1934 | 1981-08-20 | Nectar | Blount |
| Oakachoy Covered Bridge | 1915 | removed 2001-09-23 | Nixburg | Coosa |
| Edmund Pettus Bridge | 1940 | 2013-03-11 | Selma | Dallas |
| Swann Covered Bridge | 1933 | 1981-08-20 | Cleveland | Blount |
Question:
In which year did Blount County build a bridge in Cleveland that was listed on 1981-08-20?
Answer:
1933.0