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Weighted-average assumptions used to determine benefit obligations are as follows: 

<img src='content_image/134918.jpg'>

Weighted-average assumptions used to determine net peri- odic benefit costs are as follows: 

<img src='content_image/134917.jpg'>

The expected long-term rate of return on plan assets is based on fair value and is developed in consultation with outside advi- sors. A range is determined based on the composition of the asset portfolio, historical long-term rates of return, and estimates of future performance. 

For measurement purposes, an 8.0% annual rate of increase in the per capita cost of covered health care benefits for pre-Medi- care and post-Medicare retirees’ coverage is assumed for 2015. The pre-Medicare and post-Medicare rate is assumed to decrease to 5.0% for 2020, and remain at that level thereafter. 

The assumed discount rate, expected long-term rate of return on plan assets, rate of future compensation increase, and health care cost trend rate have a significant impact on the amounts reported for the benefit plans. A one-percentage-point change in these rates would have the following effects: 

<img src='content_image/134916.jpg'>

The actual and target weighted-average asset allocations for the Company’s pension plan assets as of the plan measurement date are as follows: 

<img src='content_image/134915.jpg'>

