In 2005, LEGO released 4 Duplo Building Sets sets, all of these sets have been retired. For that year, the total price of all retail sets cost $58, today those sets are valued around $131, a growth of 127%.
Most valuable 2005 LEGO Duplo Building Sets set
4085-2 50th Anniversary Bucket $41.00
Highest growth 2005 Duplo Building Sets set
5367 Yellow Tub +203.00%
Largest 2005 LEGO Duplo Building Sets set
4422 Handy Box 120 pieces
4 sets

4085-2 50th Anniversary Bucket

Theme / Subtheme Duplo / Building Sets
Year 2005
Pieces 90
Availability Retired
4085-2 LEGO Duplo 50th Anniversary Bucket
Retail $19.99
Value $41.00
Growth  +105.1%
Annual growth 3.7%

4422 Handy Box

Theme / Subtheme Duplo / Building Sets
Year 2005
Pieces 120
Availability Retired
4422 LEGO Duplo Handy Box
Retail $14.99
Value $39.74
Growth  +165.1%
Annual growth 4.8%

5367 Yellow Tub

Theme / Subtheme Duplo / Building Sets
Year 2005
Pieces 100
Availability Retired
5367 LEGO Duplo Yellow Tub
Retail $10.99
Value $33.30
Growth  +203.0%
Annual growth 5.4%

5371 Duplo Bucket Green

Theme / Subtheme Duplo / Building Sets
Year 2005
Pieces 120
Availability Retired
5371 LEGO Duplo Bucket Green
Retail $11.99
Value $17.27
Growth  +44.0%
Annual growth 1.8%