BiennioNord-ovestNord-estCentroSudIsoleItalia
1999-20002,52,62,632,82,7
2003-20052,42,52,52,82,72,6
2009-20102,32,42,42,72,62,5
2014-20152,32,32,32,62,52,4
2019-20202,22,32,32,52,42,3