of this underfunding is attributable to an international pension plan for certain non-U.S. employees that is unfunded due to tax law restrictions, as well as our unfunded U.S. nonqualified pension plans. These U.S. nonqualified pension plans provide, for certain associates, benefits that are not permitted to be funded through a qualified plan because of limits imposed by the Internal Revenue Code of 1986. Disclosure of amounts are not included in the above table regarding expected benefit payments for our unfunded pension plans. However, we anticipate annual benefit payments to be in the range of approximately $25 million to $30 million in 2007 and to remain at or near this annual level for the next several years. We can not reasonably estimate these payments for 2012 and thereafter due to the ongoing nature of the obligations under these plans. 

Deferred income tax liabilities as of December 31, 2006, were $641 million. Refer to Note 17 of Notes to Consolidated Financial Statements. This amount is not included in the total contractual obligations table because we believe this presentation would not be meaningful. Deferred income tax liabilities are calculated based on temporary differences between the tax bases of assets and liabilities and their respective book bases, which will result in taxable amounts in future years when the liabilities are settled at their reported financial statement amounts. The results of these calculations do not have a direct connection with the amount of cash taxes to be paid in any future periods. As a result, scheduling deferred income tax liabilities as payments due by period could be misleading, because this scheduling would not relate to liquidity needs. 

Minority interests of $358 million as of December 31, 2006, for consolidated entities in which we do not have a 100 percent ownership interest were recorded in the consolidated balance sheet line item other liabilities. Such minority interests are not liabilities requiring the use of cash or other resources; therefore, this amount is excluded from the contractual obligations table. 

Foreign Exchange 

Our international operations are subject to opportunities and risks relating to foreign currency fluctuations and governmental actions. We closely monitor our operations in each country and seek to adopt appropriate strategies that are responsive to fluctuations in foreign currency exchange rates. 

We use 64 functional currencies. Due to our global operations, weaknesses in some of these currencies might be offset by strength in others. In 2006, 2005 and 2004, the weighted-average exchange rates for foreign These percentages do not include the effects of our hedging activities and, therefore, do not reflect the actual impact of fluctuations in exchange rates on our operating results. Our foreign currency management program is designed to mitigate, over time, a portion of the impact of exchange rate changes on our net income and earnings per share. The total currency impact on operating income, including the effect of our hedging activities, was a decrease of approximately 1 percent in 2006. The impact of a weaker U.S. dollar increased our operating income