 Complete the following phrase:  Prior to the 2011 contest, Sweden had participated in the Eurovision Song Contest fifty times since its first entry in . Sweden had won the contest on four occasions: in 1974 with the song Waterloo performed by ABBA, in 1984 with the song Diggi-Loo Diggi-Ley performed by Herreys, in 1991 with the song Fångad av en stormvind performed by Carola, and in 1999 with the song Take Me to Your Heaven performed by Charlotte Nilsson. Following the introduction of semi-finals for the 