All Senior Notes are subject to an interest rate adjustment if the debt ratings assigned are downgraded (as defined in the agreements). Further, the Senior Notes contain a provision that repayment may be accelerated if we experience a change in control (as defined in the agreements). Our borrowings under our Senior Notes contain minimal covenants, primarily restrictions on liens, sale and leaseback transactions and consolidations, mergers and the sale of assets. All of the repayment obligations under our borrowing arrangements may be accelerated and come due prior to the applicable scheduled payment date if covenants are breached or an event of default occurs. As of February 12, 2022, we were in compliance with all covenants and expect to remain in compliance with all covenants under our borrowing arrangements.
Our adjusted debt to earnings before interest, taxes, depreciation, amortization, rent and share-based compensation expense (“EBITDAR”) ratio was 2.0:1 as of February 12, 2022 and was 2.3:1 as of February 13, 2021. We calculate adjusted debt as the sum of total debt, financing lease liabilities and rent times six; and we calculate adjusted EBITDAR by adding interest, taxes, depreciation, amortization, rent, and share-based compensation expense to net income. Adjusted debt to EBITDAR is calculated on a trailing four quarter basis. We target our debt levels to a ratio of adjusted debt to EBITDAR in order to maintain our investment grade credit ratings. We believe this is important information for the management of our debt levels. Management expects the ratio of adjusted debt to EBITDAR to return to pre-pandemic levels in the future, increasing debt levels. Once the target ratio is achieved, to the extent adjusted EBITDAR increases, we expect our debt levels to increase; conversely, if adjusted EBITDAR decreases, we would expect our debt levels to decrease. Refer to the “Reconciliation of Non-GAAP Financial Measures” section for further details of our calculation.
Stock Repurchases
From January 1, 1998 to February 12, 2022, we have repurchased a total of 151.6 million shares of our common stock at an aggregate cost of $28.2 billion, including 1.3 million shares of our common stock at an aggregate cost of $2.5 billion during the twenty-four week period ended February 12, 2022.
On December 14, 2021, the Board voted to authorize the repurchase of an additional $1.5 billion of our common stock in connection with our ongoing share repurchase program, which raised the total value of our shares authorized to be repurchased to $29.2 billion. Considering the cumulative repurchases as of February 12, 2022, we had $957.6 million remaining under the Board’s authorization to repurchase our common stock.
Subsequent to February 12, 2022 and through March 11, 2022, we have repurchased 119,542 shares of our common stock at an aggregate cost of $226.9 million.
Off-Balance Sheet Arrangements
Since our fiscal year end, we have canceled, issued and modified stand-by letters of credit that are primarily renewed on an annual basis to cover deductible payments to our casualty insurance carriers. Our total stand-by letters of credit commitment at February 12, 2022, was $131.9 million, compared with $162.4 million at August 28, 2021, and our total surety bonds commitment at February 12, 2022, was $36.4 million, compared with $35.4 million at August 28, 2021.
Financial Commitments
Except for the previously discussed Revolving Credit Agreement and the repayment of the $500 million 3.700% Senior Notes due April 2022, as of February 12, 2022, there were no significant changes to our contractual obligations as described in our Annual Report on Form 10-K for the year ended August 28, 2021.
Reconciliation of Non-GAAP Financial Measures
Management’s Discussion and Analysis of Financial Condition and Results of Operations includes certain financial measures not derived in accordance with GAAP. These non-GAAP financial measures provide additional information for determining our optimal capital structure and are used to assist management in evaluating performance and in making appropriate business decisions to maximize stockholders’ value.