what percentage of citigroup 2019s total other commitments as of december 31 , 2008 are comprised of credit card lines?
credit commitments the table below summarizes citigroup 2019s other commitments as of december 31 , 2008 and december 31 , 2007 . in millions of dollars u.s . outside december 31 , december 31 .

| <i>In millions of dollars</i> | U.S. | Outside U.S. | December 31, 2008 | December 31, 2007 |
| :--- | :--- | :--- | :--- | :--- |
| Commercial and similar letters of credit | $2,187 | $6,028 | $8,215 | $9,175 |
| One- to four-family residential mortgages | 628 | 309 | 937 | 4,587 |
| Revolving open-end loans secured by one- to four-family residential properties | 22,591 | 2,621 | 25,212 | 35,187 |
| Commercial real estate, construction and land development | 2,084 | 618 | 2,702 | 4,834 |
| Credit card lines | 867,261 | 135,176 | 1,002,437 | 1,103,535 |
| Commercial and other consumer loan commitments | 217,818 | 92,179 | 309,997 | 473,631 |
| Total | $1,112,569 | $236,931 | $1,349,500 | $1,630,949 |

the majority of unused commitments are contingent upon customers 2019 maintaining specific credit standards . commercial commitments generally have floating interest rates and fixed expiration dates and may require payment of fees . such fees ( net of certain direct costs ) are deferred and , upon exercise of the commitment , amortized over the life of the loan or , if exercise is deemed remote , amortized over the commitment period . commercial and similar letters of credit a commercial letter of credit is an instrument by which citigroup substitutes its credit for that of a customer to enable the customer to finance the purchase of goods or to incur other commitments . citigroup issues a letter on behalf of its client to a supplier and agrees to pay the supplier upon presentation of documentary evidence that the supplier has performed in accordance with the terms of the letter of credit . when drawn , the customer then is required to reimburse citigroup . one- to four-family residential mortgages a one- to four-family residential mortgage commitment is a written confirmation from citigroup to a seller of a property that the bank will advance the specified sums enabling the buyer to complete the purchase . revolving open-end loans secured by one- to four-family residential properties revolving open-end loans secured by one- to four-family residential properties are essentially home equity lines of credit . a home equity line of credit is a loan secured by a primary residence or second home to the extent of the excess of fair market value over the debt outstanding for the first mortgage . commercial real estate , construction and land development commercial real estate , construction and land development include unused portions of commitments to extend credit for the purpose of financing commercial and multifamily residential properties as well as land development projects . both secured-by-real-estate and unsecured commitments are included in this line . in addition , undistributed loan proceeds , where there is an obligation to advance for construction progress , payments are also included in this line . however , this line only includes those extensions of credit that once funded will be classified as loans on the consolidated balance sheet . credit card lines citigroup provides credit to customers by issuing credit cards . the credit card lines are unconditionally cancellable by the issuer . commercial and other consumer loan commitments commercial and other consumer loan commitments include commercial commitments to make or purchase loans , to purchase third-party receivables and to provide note issuance or revolving underwriting facilities . amounts include $ 140 billion and $ 259 billion with an original maturity of less than one year at december 31 , 2008 and december 31 , 2007 , respectively . in addition , included in this line item are highly leveraged financing commitments which are agreements that provide funding to a borrower with higher levels of debt ( measured by the ratio of debt capital to equity capital of the borrower ) than is generally considered normal for other companies . this type of financing is commonly employed in corporate acquisitions , management buy-outs and similar transactions. .

credit_card_lines = 1002437
total_commitments = 1349500
percent_credit_card_lines = credit_card_lines / total_commitments
answer = percent_credit_card_lines * 100