The share of home purchases in Ukraine financed by mortgages fell to about 7 percent last year from 30 percent in 2007, at the end of the country’s four-year property boom, according to Dragon Capital, a Kiev-based investment bank. In neighboring Poland, it’s about 70 percent.“The mortgage market’s had a massive decline,” said Volodymyr Tymochko, the managing director in charge of the company’s real-estate division. “Everything just stopped.”