Historical series of the circulating park for year registration band

Historical series of the circulating park for year registration. The series displays the number of motor vehicles/motor vehicles in circulation, distributed by age class of each individual vehicle (based on the year of first registration). The historical depth is 10 years (starting from the indicated year) and specifically the classes are: 0 years, between 1 and 3 years, between 4 and 6 years, between 7 and 9 years, between 10 12 years, between 13 and 15 years, between 16 and 18 years, between 19 and 21 years, between 22 and 24 years, between 25 and 27 years, between 28 and 30 years, over 30. The data are extracted from the database of the car tax of the Piedmont Region, where all vehicles owned by the residents of Piedmont are recorded. In order to determine the debtor and the amount, the following are processed: the owners’ personal data and ownership changes, the technical data of the vehicles and the payments made. The circulating park is identified as the set of vehicles owned by residents of the Piedmont Region that are not removed.