State Street Corp. has introduced 15 exchange-traded funds this year and says it will start more in 2009 despite a large, industrywide decline in ETF assets through the first 11 months of this year.

Jim Ross, the senior managing director at State Street Global Advisors, said the Boston company's ETF portfolios have had one of their best years in terms of net cash inflows. The funds attracted $48.9 billion of net cash inflows through Nov. 30, and he said they are having a "strong December."

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