Question: Which Share of seats has a European election (UK) of 2009?
SQL: SELECT "Share of seats" FROM "2-18933007-3" WHERE "European election (UK)" = 2009.0;

Question: Which European election (UK) has a Share of votes of 19%?
SQL: SELECT "European election (UK)" FROM "2-18933007-3" WHERE "Share of votes" = '19%';