| Year | Investments Portfolio($)'000 | Growth Rate(%) | Rate of Return on Investment(%) | Rate of Return on Investment(Net of Inflation) (%)* |
| 1994 | 1,293,473 | 10.86 | 7.87 | 5.97 |
| 1995 | 1,422,920 | 10.01 | 7.91 | 6.81 |
| 1996 | 1,503,701 | 5.68 | 8.20 | 5.40 |
| 1997 | 1,742,776 | 15.90 | 9.40 | 5.90 |
| 1998 | 1,909,807 | 9.58 | 7.30 | 4.00 |
| 1999 | 2,098,477 | 9.88 | 6.30 | 0.40 |
| 2000 | 2,236,313 | 6.57 | 6.14 | 6.14 |
| 2001 | 2,310,518 | 3.32 | 5.63 | 2.13 |
| 2002 | 2,427,546 | 5.07 | 4.22 | 1.82 |
| 2003 | 2,609,785 | 7.51 | 4.25 | 2.05 |
| 2004 | 2,748,922 | 5.33 | 5.98 | 2.48 |
| 2005 | 2,937,519 | 6.86 | 5.73 | 2.93 |
| 2006 | 3,148,290 | 7.18 | 7.62 | 5.59 |
| 2007 | 3,141,986 | (0.20) | 4.39 | 0.36 |
Total Investment Portfolio