In 1998, LEGO released 7 Duplo Building Sets sets, all of these sets have been retired. For that year, the total price of all retail sets cost $55, today those sets are valued around $254, a growth of 362%.
Most valuable 1998 LEGO Duplo Building Sets set
2763 Playground Bucket $74.57
Largest 1998 LEGO Duplo Building Sets set
3029 Limited Edition Silver Duplo Bucket 71 pieces
Most owned 1998 Duplo Building Sets set
2997 Duplo Bucket
7 sets

2198 Building Plates

Theme / Subtheme Duplo / Building Sets
Year 1998
Pieces 3
Availability Retired
2198 LEGO Duplo Building Plates
Retail $6.99
Value $15.78
Growth  +125.8%
Annual growth 3.1%

2226 Duplo Bucket

Theme / Subtheme Duplo / Building Sets
Year 1998
Pieces 50
Availability Retired
2226 LEGO Duplo Bucket
Retail $5.99
Value $29.75
Growth  +396.7%
Annual growth 6.1%

2268 Katie Cat Bucket

Theme / Subtheme Duplo / Building Sets
Year 1998
Pieces / Duplo figures 49 / 1
Availability Retired
2268 LEGO Duplo Katie Cat Bucket
Retail $5.99
Value $22.54
Growth  +276.3%
Annual growth 5.0%

2763 Playground Bucket

Theme / Subtheme Duplo / Building Sets
Year 1998
Pieces 50
Availability Retired
2763 LEGO Duplo Playground Bucket
Retail $7.99
Value $74.57
Growth  +833.3%
Annual growth 8.6%

2997 Duplo Bucket

Theme / Subtheme Duplo / Building Sets
Year 1998
Pieces / Duplo figures 40 / 1
Availability Retired
2997 LEGO Duplo Bucket
Retail $7.99
Value $39.99
Growth  +400.5%
Annual growth 6.9%

3029 Limited Edition Silver Duplo Bucket

Theme / Subtheme Duplo / Building Sets
Year 1998
Pieces / Duplo figures 71 / 1
Availability Retired
3029 LEGO Limited Edition Silver Duplo Bucket
Retail $9.99
Value $57.84
Growth  +479.0%
Annual growth 6.4%

3762 Limited Edition Duplo Bucket

Theme / Subtheme Duplo / Building Sets
Year 1998
Pieces / Duplo figures 70 / 1
Availability Retired
3762 LEGO Limited Edition Duplo Bucket
Retail $9.99
Value $13.26
Growth  +32.7%
Annual growth 1.1%