user: Question: How many years have a longitude measure of 20.0E?
Columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Year named', 'Name origin']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Agrona Linea', '40.0N', '280.0E', '2,300.0', 2006.0, 'Welsh goddess of slaughter, destroyer of life.']
SQL:

assistant: SELECT COUNT("Year named") FROM "Table" WHERE "Longitude" = '20.0E';