user: Question: What is the number of voters in 1800 that have boroughs named Drogheda?
Columns: ['Borough', 'County', 'Franchise type', 'Members', 'Voters in 1800', 'Times contested', 'Fate in 1832']
Types: ['text', 'text', 'text', 'real', 'real', 'real', 'text']
Sample row: ['Armagh', 'Armagh', 'Corporation', 1.0, 13.0, 0.0, 'Retained one seat']
SQL:

assistant: SELECT "Voters in 1800" FROM "Table" WHERE "Borough" = 'Drogheda';