content_image/278677.jpg content_image/278678.jpg content_image/278679.jpg
## 2008 Segment Information 

<img src='content_image/278677.jpg'>

## 6. Investments and Fair Value Measurements 

We classify our investments in three categories: available-for-sale, held-to-maturity, and trading. We monitor the concentration, diver- sification, maturity, and liquidity of our investment portfolio, which is primarily invested in fixed-income securities, and classify our investment portfolio as shown below: 

<img src='content_image/278678.jpg'>

The following table shows the cost, unrealized gains (losses), and fair values related to investments classified as available-for-sale and held-to-maturity: 

<img src='content_image/278679.jpg'>

