$45 billion to repurchase its common stock and paid dividends and dividend equivalents of $11.1 billion. The Company also issued $12.0 billion of long-term debt during 2014, with varying maturities through 2044, and launched a commercial paper program, with $6.3 billion outstanding as of September 27, 2014. 

The year-over-year growth in iPhone net sales and unit sales during 2015 primarily resulted from strong demand for iPhone 6 and 6 Plus during 2015. Overall average selling prices (“ASPs”) for iPhone increased by 11% during 2015 compared to 2014, due primarily to the introduction of iPhone 6 and 6 Plus in September 2014, partially offset by the effect of weakness in most foreign currencies relative to the U.S. dollar. 

The year-over-year growth in iPhone net sales and unit sales in 2014 resulted primarily from the successful introduction of new iPhones in the latter half of calendar year 2013, the successful launch of iPhone 6 and 6 Plus beginning in September 2014, and expanded distribution. iPhone unit sales grew in all of the Company’s operating segments, while iPhone net sales grew in all segments except Rest of Asia Pacific. Overall ASPs for iPhone were relatively flat in 2014 compared to 2013, with growth in ASPs in the Americas segment being offset by a decline in ASPs in the Greater China, Japan and Rest of Asia Pacific segments. 

Net sales and unit sales for iPad declined during 2015 compared to 2014. The Company believes the decline in iPad sales is due in part to a longer repurchase cycle for iPads and some level of cannibalization from the Company’s other products. iPad ASPs declined by 5% during 2015 compared to 2014, primarily as a result of the effect of weakness in most foreign currencies relative to the U.S. dollar and a shift in mix to lower-priced iPads. 

Net sales and unit sales for iPad declined in 2014 compared to 2013. iPad net sales and unit sales grew in the Greater China and Japan segments but this growth was more than offset by a decline in all other segments. Overall iPad ASPs were relatively flat in 2014 compared to 2013 with a shift in mix to higher- priced iPads being offset by the October 2013 price reduction of iPad miniTM. ASPs increased in the Japan and Rest of Asia Pacific segments but were slightly down in other segments. 

he year-over-year growth in Mac net sales and unit sales during 2015 was driven by strong demand for Mac portables. Mac ASPs declined 3% during 2015 compared to 2014 largely due to the effect of weakness in most foreign currencies relative to the U.S. dollar. 

The year-over-year growth in Mac net sales and unit sales for 2014 was primarily driven by increased sales of MacBook Air, MacBook Pro and Mac Pro. Mac net sales and unit sales increased in all of the Company’s operating segments. Mac ASPs decreased during 2014 compared to 2013 primarily due to price reductions on certain Mac models and a shift in mix towards Mac portable systems. 

The increase in net sales of Services during 2015 compared to 2014 was primarily due to growth from Internet Services and licensing. The App Store, included within Internet Services, generated strong year-over-year net sales growth of 29%.