the fourth quarter of 2010 resulted in a significant adjustment to our overall cost structure, especially in North America. Finished product operations typically have lower gross profit margins and greater exposure to fluctuations in the cost of raw materials when compared to concentrate operations. The following inputs represent a substantial portion of the Company's total cost of goods sold: (1) sweeteners, (2) metals, (3) juices and

(4) PET. The majority of these costs are included in our North America and Bottling Investments operating segments. The cost to purchase these inputs increased significantly in 2011 when compared to 2010, and as a result the Company incurred incremental costs of $800 million related to these inputs during 2011. 

Year Ended December 31, 2012, versus Year Ended December 31, 2011 

Selling, general and administrative expenses increased $316 million, or 2 percent. Foreign currency fluctuations decreased selling, general and administrative expenses by

3 percent. The decrease in stock-based compensation expense in 2012 was primarily due to the reversal of previously recognized expenses related to the Company's long-term incentive compensation programs. As a result of the Company's revised outlook of the unfavorable impact foreign currency fluctuations are projected to have on certain performance periods, the Company lowered the estimated payouts associated with these periods. Advertising expenses increased during the year and reflect the Company's continued investment in the health and strength of our brands and building market execution capabilities while simultaneously capturing incremental marketing efficiencies. The increase in bottling and distribution expenses includes the full year impact of the Company's acquisition of Great Plains in December 2011 as well as our acquisition of bottling operations in Vietnam, Cambodia and Guatemala during 2012. Other operating expenses decreased during the year, partially reflecting the impact of the Company's productivity and integration initiatives. 

In 2013, our pension expense is expected to decrease by approximately $60 million compared to 2012. The anticipated decrease is primarily due to approximately $640 million of contributions the Company expects to make to various plans in 2013, as well as favorable returns on plan assets in 2012. The favorable impact of these items will be partially offset by the unfavorable impact of a decrease in the weighted-average discount rate used to calculate the Company's benefit obligation. Refer to the heading "Liquidity, Capital Resources and Financial Position" below for information related to these contributions. Refer to the heading "Critical Accounting Policies and Estimates — Pension Plan Valuations" above and Note 13 of Notes to Consolidated Financial Statements for additional information related to the discount rates used by the Company. 

As of December 31, 2012, we had $467 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under our plans. This cost is expected to be recognized over a weighted-average period of 1.8 years as stock-based compensation expense.