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:
| Municipality | Inhabitants | Mayor | Party | Election |
| --- | --- | --- | --- | --- |
| Florence | 370702.0 | Matteo Renzi | Democratic Party | 2009.0 |
| Prato | 187994.0 | Roberto Cenni | The People of Freedom | 2009.0 |
| Livorno | 161084.0 | Alessandro Cosimi | Democratic Party | 2009.0 |
| Arezzo | 100140.0 | Giuseppe Fanfani | Democratic Party | 2011.0 |
| Pistoia | 90226.0 | Samuele Bertinelli | Democratic Party | 2012.0 |
| Pisa | 88332.0 | Marco Filippeschi | Democratic Party | 2008.0 |
| Lucca | 84928.0 | Alessandro Tambellini | Democratic Party | 2012.0 |
| Grosseto | 82284.0 | Emilio Bonifazi | Democratic Party | 2011.0 |
| Massa | 71006.0 | Alessandro Volpi | Democratic Party | 2013.0 |
| Carrara | 65612.0 | Angelo Zubbani | Italian Socialist Party | 2012.0 |
| Viareggio | 64564.0 | Leonardo Betti | Democratic Party | 2013.0 |
| Siena | 54561.0 | Bruno Valentini | Democratic Party | 2013.0 |
| Scandicci | 50304.0 | Simone Gheri | Democratic Party | 2009.0 |
Question:
Which Election has a Party of democratic party, and a Mayor of leonardo betti?
Answer:
2013.0