in Maio v. Aetna that would have resulted in dismissal of the RICO claims. On March 4, 2002, the defendants filed a Motion for Partial Reconsideration of the February 20, 2002 Dismissal order.
Administrative services fees are earned as services are performed. Administrative services generally include the processing of claims, offering access to our provider networks and clinical programs, and responding to customer services inquiries from members of self-funded employers. Under ASO contracts, self-funded employers and, for TRICARE ASO, the Department of Defense, retain the risk of financing the cost of health benefits.
Total selling, general and administrative, or SG&A, expenses as a percentage of premium revenues and administrative services fees, or SG&A expense ratio, for 2001 was 15.3%, increasing 80 basis points from 14.5% for 2000. Similar increases occurred in the SG&A expense ratios of our Commercial and Government segments as indicated in the preceding table. These increases resulted from an increase in the mix of ASO membership, primarily from the TRICARE acquisition, and planned spending on infrastructure and technology initiatives. For 2002, we are expecting the SG&A ratio to be in the 15% to 16% range as the percentage of revenues we derive from administrative services fees increases throughout the year.
Prior period adverse claims development primarily in our PPO and Medicare products initially identified during an analysis of February and March 1999 medical claims resulted in the $35.0 million reserve strengthening. In addition, we paid HCA $5.0 million to settle certain contractual issues associated with the March 31, 1999 hospital agreement in Florida.
Investment and other income totaled $115.0 million in 2000, compared to $155.0 million in 1999, a decline of $40 million. This decrease resulted from a lower average invested balance caused primarily by the sale of the workers’ compensation business, lower realized investment gains and a non-recurring $11.5 million gain in 1999 from the sale of a tangible asset.
On October 11, 2001, we replaced our existing credit agreement with two new unsecured revolving credit agreements consisting of a $265 million, 4-year revolving credit agreement and a $265 million, 364-day revolving credit agreement with a one-year term out option. Under these new agreements, at our option, we can borrow on either a competitive advance basis or a revolving credit basis. The revolving credit portion of both the 4-year and 364-day agreements bear interest at either a fixed rate or floating rate based on LIBOR plus a spread. The spread, which varies depending on our credit ratings, ranges from 80 to 125 basis points for our 4-year agreement, and 85 to 137.5 basis points for our 364-day agreement. We also pay an annual facility fee regardless of utilization. This facility fee, currently 25 basis points, may fluctuate between 15 and 50 basis points, depending upon our credit ratings. The competitive advance portion of any borrowings under either the 4-year or 364-day revolving credit agreements will bear interest at market rates prevailing at the time of borrowing on either a fixed rate or a floating rate basis, at our option.
Our Medicare+Choice contracts with the federal government are renewed for a one-year term each December 31 unless terminated 90 days prior thereto. Increased funding beginning March 1, 2001 specific to the Medicare, Medicaid and State Children’s Health Insurance Benefits Improvement and Protection Act, or BIPA, is being used to provide additional funding under contracts with our providers and to lower member premiums in certain markets. Our 2002 average rate of statutory increase under the Medicare+Choice contracts, including the March 1, 2001 BIPA increase, is approximately 5.0%. Over the last five years, annual increases have ranged from as low as the January 1998 increase of 1.8% to as high as 5.0% in January 2002, with an average of approximately 2.6%. Legislative proposals are being considered which may revise the Medicare+Choice program’s current support of the use of managed health care for Medicare+Choice beneficiaries and future reimbursement rates. We are unable to predict the outcome of these proposals or the impact they may have on our financial position, results of operations, or cash flows.
If competitive pressures restrict or lower the premiums we receive, our financial results could suffer.
We generally establish one-year commercial membership contracts with employer groups, subject to cancellation by the employer group’s written notice. Our TRICARE contracts with the federal government and various state Medicaid programs are generally multi-year contracts. Our Medicare+Choice contracts with the federal government renew annually. We bill and collect premium remittances from employer groups and some individual Medicare+Choice members monthly. We receive monthly premiums from the federal government and various states according to government specified reimbursement rates and various contractual terms.
We compute depreciation expense using the straight-line method over estimated useful lives ranging from 3 to 10 years for equipment, 3 to 7 years for computer software, and 20 to 40 years for buildings. Depreciation expense was $92.9 million in 2001, $84.3 million in 2000, and $78.5 million in 1999.
We periodically review long-lived assets for impairment whenever adverse events or changes in circumstances indicate the carrying value of the asset may not be recoverable. Losses are recognized when the undiscounted future cash flows expected to result from the use of the asset and its eventual disposition are less than its carrying value. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell. In addition, we periodically review the estimated lives of all long-lived assets for reasonableness. See Note 13 for a discussion related to our 1999 impairment and estimated life review.
Gross realized investment gains were $25.1 million in 2001, $8.1 million in 2000, and $18.0 million in 1999. Gross realized investment losses were $11.2 million in 2001, $1.5 million in 2000, and $7.4 million in 1999.
In our opinion, the accompanying consolidated balance sheets and the related consolidated statements of operations, of stockholders’ equity and of cash flows present fairly, in all material respects, the consolidated financial position of Humana Inc. and its subsidiaries at December 31, 2001 and 2000, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2001, in conformity with accounting principles generally accepted in the United States of America. These financial statements are the responsibility of the Company’s management; our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these statements in accordance with auditing standards generally accepted in the United States of America, which require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.