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 $1,151, a growth of 643%.
Most valuable 2005 LEGO Vikings set
7019 Viking Fortress vs. the Fafnir Dragon $418.73
Highest growth 2005 Vikings set
7015 Viking Warrior vs. the Fenris Wolf +1161.92%
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 $62.97
Growth  +1161.9%
Annual growth 7.4%

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 $125.73
Growth  +1158.6%
Annual growth 8.3%

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 $186.92
Growth  +835.1%
Annual growth 6.3%

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 $356.82
Growth  +613.8%
Annual growth 6.5%

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 $418.73
Growth  +498.3%
Annual growth 6.3%