In 2009, LEGO released 5 City Farm sets, all of these sets have been retired. For that year, the total price of all retail sets cost $165, today those sets are valued around $591, a growth of 257%.
Most valuable 2009 LEGO City Farm set
7637 Farm $281.13
Highest growth 2009 City Farm set
7636 Combine Harvester +357.03%
Most owned 2009 City Farm set
7634 Tractor
5 sets

4899 Mini Tractor

Theme / Subtheme City / Farm
Year 2009
Pieces / Minifigs 28 / 1
Availability Retired
4899 LEGO City Farm Mini Tractor
promotional
Value $7.99
Annual growth 7.5%

7634 Tractor

Theme / Subtheme City / Farm
Year 2009
Pieces / Minifigs 78 / 1
Availability Retired
7634 LEGO City Farm Tractor
Retail $12.99
Value $39.49
Growth  +204.0%
Annual growth 9.0%

7635 4WD with Horse Trailer

Theme / Subtheme City / Farm
Year 2009
Pieces / Minifigs 176 / 2
Availability Retired
7635 LEGO City Farm 4WD with Horse Trailer
Retail $17.48
Value $56.69
Growth  +224.3%
Annual growth 6.2%

7636 Combine Harvester

Theme / Subtheme City / Farm
Year 2009
Pieces / Minifigs 360 / 1
Availability Retired
7636 LEGO City Farm Combine Harvester
Retail $44.99
Value $205.62
Growth  +357.0%
Annual growth 5.6%

7637 Farm

Theme / Subtheme City / Farm
Year 2009
Pieces / Minifigs 609 / 3
Availability Retired
7637 LEGO City Farm
Retail $89.99
Value $281.13
Growth  +212.4%
Annual growth 4.0%