In 2010, LEGO released 2 City Police sets, all of these sets have been retired. For that year, the total price of all retail sets cost $4, today those sets are valued around $14, a growth of 255%.
Most valuable 2010 LEGO City Police set
30011 Police Dinghy $8.67
Highest growth 2010 City Police set
30013 Police Buggy +37.59%
2 sets

30011 Police Dinghy

Theme / Subtheme City / Police
Year 2010
Pieces / Minifigs 16 / 1
Availability Retired
30011 LEGO City Police Dinghy
promotional
Value $8.67
Annual growth 1.8%

30013 Police Buggy

Theme / Subtheme City / Police
Year 2010
Pieces / Minifigs 34 / 1
Availability Retired
30013 LEGO City Police Buggy
Retail $3.99
Value $5.49
Growth  +37.6%
Annual growth 2.4%