▁to ▁ 5 7 . 9 %. ▁On ▁May ▁ 2 8 ▁Bir ka ▁Line ▁officially ▁became ▁a ▁daughter ▁company ▁of ▁E cker ö ▁Line . ▁ ▁Fle et ▁ ▁Bir ka ▁Cru ises ▁ ▁MS ▁Bir ka ▁Stockholm ▁ ▁Bir ka ▁C argo ▁▁ ▁MS ▁Bir ka ▁Car rier ▁ ▁MS ▁Bir ka ▁Ex porter ▁ ▁MS ▁Bir ka ▁Express ▁ ▁MS ▁Bir ka ▁Sh i pper ▁ ▁MS ▁Bir ka ▁Tr ader ▁ ▁MS ▁Bir ka ▁Trans porter ▁ ▁MS ▁Balt ic ▁Ex cell ent ▁ ▁Form er ▁ships ▁MS ▁Pr ins ess an ▁( 1 9 7 1 – 7 7 ) ▁/ ▁MS ▁Pr insen ▁( 1 9 7 7 – 7 8 ) — sc ra pped ▁ 1 9 8 7 ▁MS ▁Baron ess an ▁( 1 9 7 2 – 8 0 ) — sc ra pped ▁ 2 0 0 3 ▁MS ▁Free port ▁( 1 9 7 3 – 7 4 ) — now ▁MS ▁Disc overy ▁Sun ▁for ▁Disc overy ▁Cru ise ▁Line ▁MS ▁Dro tt ningen ▁( 1 9 7 1 – 7 7 ) — sc ra pped ▁ 2 0 0 5 ▁MS ▁Pr ins ess an ▁( 1 9 7 8 – 8 7 ) — sc ra pped ▁ 2 0 0 8 ▁MS ▁Bir ka ▁Princess ▁( 1 9 8 6 – 2 0 0 6 ) — s ank ▁in ▁ 2 0 0 7 ▁as ▁MS ▁Sea ▁Diam ond ▁( Louis ▁Cru ise ▁L ines