By Christine Williamson Source: Pensions & Investments The 1,000 largest U.S. retirement plans had a banner year, propelled in large part by strong returns in public and private equity and other alternative investment strategies, as well as from higher contributions to defined benefit and defined contribution plans. In the year ended Sept. 30, aggregate assets of the 1,000 largest U.S. retirement funds rose 16.9% to $14.13 trillion, a big improvement from the previous year when assets managed to rise [...]