In 2012, LEGO released 6 Duplo Zoo sets, all of these sets have been retired. For that year, the total price of all retail sets cost $243, today those sets are valued around $617, a growth of 154%.
Most valuable 2012 LEGO Duplo Zoo set
6157 The Big Zoo $307.13
Highest growth 2012 Duplo Zoo set
6173 Panda +288.11%
Most owned 2012 Duplo Zoo set
6156 Photo Safari
6 sets

6144 Zoo Train

Theme / Subtheme Duplo / Zoo
Year 2012
Pieces / Duplo figures 12 / 1
Availability Retired
6144 LEGO Duplo Zoo Train
Retail $24.99
Value $36.18
Growth  +44.8%
Annual growth 2.8%

6156 Photo Safari

Theme / Subtheme Duplo / Zoo
Year 2012
Pieces / Duplo figures 67 / 3
Availability Retired
6156 LEGO Duplo Zoo Photo Safari
Retail $59.99
Value $146.24
Growth  +143.8%
Annual growth 8.1%

6157 The Big Zoo

Theme / Subtheme Duplo / Zoo
Year 2012
Pieces / Duplo figures 147 / 4
Availability Retired
6157 LEGO Duplo The Big Zoo
Retail $89.99
Value $307.13
Growth  +241.3%
Annual growth 7.6%

6158 Animal Clinic

Theme / Subtheme Duplo / Zoo
Year 2012
Pieces / Duplo figures 62 / 2
Availability Retired
6158 LEGO Duplo Zoo Animal Clinic
Retail $39.99
Value $71.72
Growth  +79.3%
Annual growth 4.1%

6172 Zoo Truck

Theme / Subtheme Duplo / Zoo
Year 2012
Pieces / Duplo figures 8 / 1
Availability Retired
6172 LEGO Duplo Zoo Truck
Retail $19.99
Value $24.80
Growth  +24.1%
Annual growth 1.8%

6173 Panda

Theme / Subtheme Duplo / Zoo
Year 2012
Pieces / Duplo figures 8 / 1
Availability Retired
6173 LEGO Duplo Zoo Panda
Retail $7.99
Value $31.01
Growth  +288.1%
Annual growth 5.5%