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 $1,644, a growth of 961%.
Most valuable 2005 LEGO Vikings set
7019 Viking Fortress vs. the Fafnir Dragon $708.27
Highest growth 2005 Vikings set
7016 Viking Boat vs. the Wyvern Dragon +1385.19%
Most owned 2005 Vikings set
7018 Viking Ship vs. the Midgard Serpent
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 $53.12
Growth  +964.5%
Annual growth 7.9%

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 $148.37
Growth  +1385.2%
Annual growth 9.5%

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 $187.54
Growth  +838.2%
Annual growth 7.2%

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 $546.33
Growth  +992.9%
Annual growth 8.3%

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 $708.27
Growth  +912.0%
Annual growth 8.5%