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 $1,177, a growth of 660%.
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 +1199.00%
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 $64.82
Growth  +1199.0%
Annual growth 7.6%

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 $128.23
Growth  +1183.6%
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 $196.99
Growth  +885.4%
Annual growth 6.4%

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 $368.29
Growth  +636.7%
Annual growth 6.7%

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 6.5%