In 2014, LEGO released 4 Friends Summer sets, all of these sets have been retired. For that year, the total price of all retail sets cost $80, today those sets are valued around $148, a growth of 85%.
Most valuable 2014 LEGO Friends Summer set
41037 Stephanie's Beach House $74.99
Theme / Subtheme Friends / Summer
Year 2014
Pieces / Mini-doll figures 29 / 1
Availability Retired
30114 LEGO Friends Andrea's Beach Lounge
promotional
Value $8.00
Annual growth 5.2%
Theme / Subtheme Friends / Summer
Year 2014
Pieces / Mini-doll figures 78 / 1
Availability Retired
41028 LEGO Friends Emma's Lifeguard Post
Retail $9.99
Value $15.00
Growth  +50.2%
Annual growth 4.1%
Theme / Subtheme Friends / Summer
Year 2014
Pieces / Mini-doll figures 297 / 2
Availability Retired
41034 LEGO Friends Caravan
Retail $29.99
Value $50.00
Growth  +66.7%
Annual growth 5.6%
Theme / Subtheme Friends / Summer
Year 2014
Pieces / Mini-doll figures 369 / 2
Availability Retired
41037 LEGO Friends Stephanie's Beach House
Retail $39.99
Value $74.99
Growth  +87.5%
Annual growth 4.1%