ISTAT populationQundnote 468Qc000 1billion 8bn percent Trotanoy Darolebu 454Qc000 3Qc300Qc000 293Qc000 BookScan 9Qc000Qc000 220m 3bn 5Qc209 15Qc000Qc000 pQpa Lloro Enticho 2Qp2bn 396Qc000 18Qp06 314Qc000 398Qc000 100million 472Qc000 500Qc000 6Qc000Qc000 12Qc000Qc000 28m 615Qc000 3Qc200Qc000 figures