No-one!! There wasn't a competition until 1956.
Yes, The Netherlands have won Eurovision 4 times.
Alexander Rybak from Norway won the Eurovision 2009 contest.
Portugal has never won the Eurovision Song Contest
Alexander Rybak won Eurovision in 2009 with a record 387 points.
Azerbaijan won.
Germany
Lena Meyer-Landrut representing Germany won the 2010 Eurovision Song Contest.
Turkey won it
Albania won it
No, Bulgaria have never won the Eurovision Song Contest.
Portugal have never won the Eurovision Song Contest, up to and including the 2011 contest.