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The following table is a roll forward of the Level 3 investments of our pension and postretirement benefit plan assets during the year ended May 30, 2010: 

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The net change in Level 3 assets attributable to unrealized gains at May 30, 2010, were $72.2 million for our pension plan assets, and $1.2 million for our postretirement plan assets. 

Expected Rate of Return on Plan Assets Our expected rate of return on plan assets is determined by our asset allocation, our historical long-term investment performance, our estimate of future long-term returns by asset class (using input from our actuaries, investment services, and investment managers), and 

long-term inflation assumptions. We review this assumption annually for each plan, however, our annual investment perfor- mance for one particular year does not, by itself, significantly influence our evaluation. 

Weighted-average asset allocations for the past two fiscal years for our defined benefit pension and other postretirement benefit plans are as follows: 

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The investment objective for our defined benefit pension and other postretirement benefit plans is to secure the benefit obli- gations to participants at a reasonable cost to us. Our goal is to optimize the long-term return on plan assets at a moderate level of risk. The defined benefit pension and other postretirement portfolios are broadly diversified across asset classes. Within 

asset classes, the portfolios are further diversified across invest- ment styles and investment organizations. For the defined benefit pension and other postretirement benefit plans, the long-term investment policy allocations are: 30 percent to equities in the United States; 20 percent to international equities; 10 percent to private equities; 30 percent to fixed income; and 10 percent to real 

