In 2006, LEGO released 2 City Construction sets, all of these sets have been retired. For that year, the total price of all retail sets cost $95, today those sets are valued around $1,080, a growth of 1037%.
Most valuable 2006 LEGO City Construction set
7905 Building Crane $779.36
Highest growth 2006 City Construction set
7900 Heavy Loader +1101.60%
2 sets

7900 Heavy Loader

Theme / Subtheme City / Construction
Year 2006
Pieces / Minifigs 347 / 1
Availability Retired
7900 LEGO City Construction Heavy Loader
Retail $24.99
Value $300.28
Growth  +1101.6%
Annual growth 6.4%

7905 Building Crane

Theme / Subtheme City / Construction
Year 2006
Pieces / Minifigs 721 / 3
Availability Retired
7905 LEGO City Construction Building Crane
Retail $69.99
Value $779.36
Growth  +1013.5%
Annual growth 8.1%