In 2005, LEGO released 5 Belville sets, all of these sets have been retired. For that year, the total price of all retail sets cost $136, today those sets are valued around $650, a growth of 378%.
Most valuable 2005 LEGO Belville set
5960 The Mermaid Castle $379.05
Highest growth 2005 Belville set
5964 Thumbelina +697.33%
Most owned 2005 Belville set
5963 The Princess and the Pea
5 sets

5960 The Mermaid Castle

Theme Belville
Year 2005
Pieces / Figures 237 / 3
Availability Retired
5960 LEGO Belville The Mermaid Castle
Retail $69.99
Value $379.05
Growth  +441.6%
Annual growth 8.9%

5961 Snow Queen

Theme Belville
Year 2005
Pieces / Figures 59 / 1
Availability Retired
5961 LEGO Belville Snow Queen
Retail $19.99
Value $83.36
Growth  +317.0%
Annual growth 8.1%

5962 The Tinderbox

Theme Belville
Year 2005
Pieces / Figures 82 / 1
Availability Retired
5962 LEGO Belville The Tinderbox
Retail $19.99
Value $63.85
Growth  +219.4%
Annual growth 6.8%

5963 The Princess and the Pea

Theme Belville
Year 2005
Pieces / Figures 55 / 1
Availability Retired
5963 LEGO Belville The Princess and the Pea
Retail $19.99
Value $76.08
Growth  +280.6%
Annual growth 3.9%

5964 Thumbelina

Theme Belville
Year 2005
Pieces / Figures 49 / 1
Availability Retired
5964 LEGO Belville Thumbelina
Retail $5.99
Value $47.76
Growth  +697.3%
Annual growth 10.9%