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 $579, a growth of 250%.
Most valuable 2009 LEGO City Farm set
7637 Farm $270.25
Highest growth 2009 City Farm set
7636 Combine Harvester +357.57%
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 $9.61
Annual growth 7.8%

7634 Tractor

Theme / Subtheme City / Farm
Year 2009
Pieces / Minifigs 78 / 1
Availability Retired
7634 LEGO City Farm Tractor
Retail $12.99
Value $38.76
Growth  +198.4%
Annual growth 8.7%

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 $55.01
Growth  +214.7%
Annual growth 6.0%

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 $205.86
Growth  +357.6%
Annual growth 5.7%

7637 Farm

Theme / Subtheme City / Farm
Year 2009
Pieces / Minifigs 609 / 3
Availability Retired
7637 LEGO City Farm
Retail $89.99
Value $270.25
Growth  +200.3%
Annual growth 3.9%