In 2009, LEGO released 4 Seasonal sets in the subtheme Christmas, all of these sets have been retired. For that year, the total price of all retail sets cost $25, today those sets are valued around $60, a growth of 139%.
Most valuable 2009 LEGO Seasonal set
40000 Cool Santa Set $21.73
Highest growth 2009 Seasonal set
40001 Santa Claus +225.85%
Most owned 2009 Seasonal set
40002 Xmas Tree
4 sets

40000 Cool Santa Set

Theme / Subtheme Seasonal / Christmas
Year 2009
Pieces 152
Availability Retired
40000 LEGO Christmas Cool Santa Set
Retail $9.99
Value $21.73
Growth  +117.5%
Annual growth 4.8%

40001 Santa Claus

Theme / Subtheme Seasonal / Christmas
Year 2009
Pieces 42
Availability Retired
40001 LEGO Christmas Santa Claus
Retail $4.99
Value $16.26
Growth  +225.9%
Annual growth 3.5%

40002 Xmas Tree

Theme / Subtheme Seasonal / Christmas
Year 2009
Pieces 61
Availability Retired
40002 LEGO Christmas Xmas Tree
Retail $4.99
Value $9.95
Growth  +99.4%
Annual growth 3.1%

40003 Snowman

Theme / Subtheme Seasonal / Christmas
Year 2009
Pieces 44
Availability Retired
40003 LEGO Christmas Snowman
Retail $4.99
Value $11.79
Growth  +136.3%
Annual growth 3.5%