In 2015, LEGO released 4 Duplo My First sets, all of these sets have been retired. For that year, the total price of all retail sets cost $70, today those sets are valued around $144, a growth of 106%.
Most valuable 2015 LEGO Duplo My First set
10617 My First Farm $59.09
4 sets

10603 My First Bus

Theme / Subtheme Duplo / My First
Year 2015
Pieces / Duplo figures 17 / 1
Availability Retired
10603 LEGO Duplo My First Bus
Retail $14.99
Value $28.45
Growth  +89.8%
Annual growth 7.6%

10615 My First Tractor

Theme / Subtheme Duplo / My First
Year 2015
Pieces / Duplo figures 12 / 2
Availability Retired
10615 LEGO Duplo My First Tractor
Retail $14.99
Value $22.57
Growth  +50.6%
Annual growth 6.3%

10616 My First Playhouse

Theme / Subtheme Duplo / My First
Year 2015
Pieces / Duplo figures 25 / 2
Availability Retired
10616 LEGO Duplo My First Playhouse
Retail $19.99
Value $34.13
Growth  +70.7%
Annual growth 6.5%

10617 My First Farm

Theme / Subtheme Duplo / My First
Year 2015
Pieces / Duplo figures 26 / 2
Availability Retired
10617 LEGO Duplo My First Farm
Retail $19.99
Value $59.09
Growth  +195.6%
Annual growth 9.0%