Over 15 years, New Zealand's economy and social capital faced serious problems: the youth suicide rate grew sharply into one of the highest in the developed world; the proliferation of food banks increased dramatically to an estimated 365 in 1994; marked increases in violent and other crime were observed; the number of New Zealanders estimated to be living in poverty grew by at least 35% between 1989 and 1992 while child poverty doubled from 14% in 1982 to 29% in 1994. Those on low incomes failed to return to the 1984 standard of living until 1996; the lowest 30% did not recover their own 1980s living standards for twenty years. The health of the New Zealand population was also especially hard-hit, leading to a significant deterioration in health standards among working and middle-class people. In addition, many of the promised economic benefits of the experiment never materialised. Between 1985 and 1992, New Zealand's economy grew by 4.7% during the same period in which the average OECD nation grew by 28.2%. From 1984 to 1993 inflation averaged 9% per year, New Zealand's credit rating dropped twice, and foreign debt quadrupled. Between 1986 and 1992, the unemployment rate rose from 3.6% to 11%.