In 2005, LEGO released 5 Vikings sets, all of these sets have been retired. For that year, the total price of all retail sets cost $155, today those sets are valued around $1,257, a growth of 711%.
Most valuable 2005 LEGO Vikings set
7018 Viking Ship vs. the Midgard Serpent $436.67
Highest growth 2005 Vikings set
7015 Viking Warrior vs. the Fenris Wolf +1258.32%
Largest 2005 LEGO Vikings set
7019 Viking Fortress vs. the Fafnir Dragon 1,019 pieces
5 sets

7015 Viking Warrior vs. the Fenris Wolf

Theme Vikings
Year 2005
Pieces / Minifigs 76 / 1
Availability Retired
7015 LEGO Viking Warrior vs. the Fenris Wolf
Retail $4.99
Value $67.78
Growth  +1258.3%
Annual growth 7.7%

7016 Viking Boat vs. the Wyvern Dragon

Theme Vikings
Year 2005
Pieces / Minifigs 112 / 2
Availability Retired
7016 LEGO Viking Boat vs. the Wyvern Dragon
Retail $9.99
Value $126.86
Growth  +1169.9%
Annual growth 8.4%

7017 Viking Catapult vs. the Nidhogg Dragon

Theme Vikings
Year 2005
Pieces / Minifigs 225 / 2
Availability Retired
7017 LEGO Viking Catapult vs. the Nidhogg Dragon
Retail $19.99
Value $200.21
Growth  +901.6%
Annual growth 6.6%

7018 Viking Ship vs. the Midgard Serpent

Theme Vikings
Year 2005
Pieces / Minifigs 578 / 6
Availability Retired
7018 LEGO Viking Ship vs. the Midgard Serpent
Retail $49.99
Value $436.67
Growth  +773.5%
Annual growth 7.1%

7019 Viking Fortress vs. the Fafnir Dragon

Theme Vikings
Year 2005
Pieces / Minifigs 1,019 / 6
Availability Retired
7019 LEGO Viking Fortress vs. the Fafnir Dragon
Retail $69.99
Value $425.47
Growth  +507.9%
Annual growth 6.6%