In 2005, LEGO released 6 Technic sets, all of these sets have been retired. For that year, the total price of all retail sets cost $326, today those sets are valued around $967, a growth of 197%.
Most valuable 2005 LEGO Technic set
8421 Mobile Crane $480.88
Highest growth 2005 Technic set
8419 Excavator +375.24%
6 sets

8415 Dump Truck

Theme Technic
Year 2005
Pieces 284
Availability Retired
8415 LEGO Technic Dump Truck
Retail $29.99
Value $74.54
Growth  +148.5%
Annual growth 2.6%

8416 Fork-Lift

Theme Technic
Year 2005
Pieces 729
Availability Retired
8416 LEGO Technic Fork-Lift
Retail $69.99
Value $130.66
Growth  +86.7%
Annual growth 3.6%

8418 Mini Loader

Theme Technic
Year 2005
Pieces 66
Availability Retired
8418 LEGO Technic Mini Loader
Retail $5.99
Value $21.40
Growth  +257.3%
Annual growth 4.6%

8419 Excavator

Theme Technic
Year 2005
Pieces 286
Availability Retired
8419 LEGO Technic Excavator
Retail $19.99
Value $95.00
Growth  +375.2%
Annual growth 8.5%

8420 Street Bike

Theme Technic
Year 2005
Pieces 506
Availability Retired
8420 LEGO Technic Street Bike
Retail $49.99
Value $164.96
Growth  +230.0%
Annual growth 5.9%

8421 Mobile Crane

Theme Technic
Year 2005
Pieces 1,884
Availability Retired
8421 LEGO Technic Mobile Crane
Retail $149.99
Value $480.88
Growth  +220.6%
Annual growth 6.7%