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## Note 48 – Defined benefit superannuation plans (continued) History of experience adjustments 

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The consolidated entity expects to contribute $29.8 million (2011: $10.6 million) to the defined benefit plans during the next financial year. 

The fair value of plan assets does not include any amounts relating to any property occupied by, or other assets used by, the consolidated entity. Less than 0.5% of the fair value of the plan assets in the SuperSolution Master Trust – AGL Division comprises ordinary shares in the Parent Entity. 

The expected return on plan assets is determined by weighting the expected long-term return for each asset class by the target allocation of assets to each class and allowing for correlations of the investment returns between asset classes. The returns used for each asset class are net of investment tax and investment fees. An allowance for administration expenses has been deducted from the expected return. 

The actual return on plan assets was $12.6 million (2011: $12.5 million). 

## Categories of plan assets 

The major categories of plan assets as a percentage of the fair value of total plan assets at the reporting date are as follows: 

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## Principal actuarial assumptions 

The principal actuarial assumptions at the reporting date (expressed as weighted averages) were as follows: 

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## Defined contribution superannuation plans 

The consolidated entity makes contributions to a number of defined contribution superannuation plans. The amount recognised as an expense for the financial year ended 30 June 2012 was $15.8 million (2011: $14.4 million). 

