MILAN, June 26 (Reuters) - New car sales in Italy -- the key home market of loss-making automaker Fiat -- are likely to show a 13 percent fall in June, the chairman of auto industry group UNRAE said on Wednesday. "End-of-month projections show a fall in line with the average for the last five months, so something around 13 percent to about 190,000 vehicles," Salvatore Pistola, head of the National Union of Foreign Automotive Representatives (UNRAE) told Reuters.