measurements. This is driven primarily by a higher concentration of advertising spend in the first quarter, when advertising prices are lowest and demand for our products is highest. and a lower concentration of advertising spend in the fourth quarter. when advertising costs are highest and demand for our products is lowest. International markets. Our products are available in over 190 countries. Our international revenue represented 35% and 31% of our total revenue for the fiscal year ended December 31, 2014 and nine months ended September 30, 2015. respectively. We vary our pricing to align with local market conditions and our international businesses typically earn revenue in local currencies, primanly the Euro. As foreign currency exchange rates change. translation of the statements of operations of our international businesses into U.S. dollars affects year-over-year comparabildy of operating results. Business combinations. Acquisitions are an important part of our growth strategy, and we expect to make additional acquisitions in the future. Since January 2009 we have invested approximately $1,284.0 million to acquire 25 new brands for our dating portfolio including OkCupid, Meetic. Twoo and PlentyOfFish. As a consequence of the contributions of these businesses and acquisition-related expenses, our combined results of operations may not be comparable between periods. Public company expenses. Prior to completion of this offering, IAC has provided to us significant corporate and shared services related to corporate functions such as executive oversight, risk management, information technology, accounting. audit, legal. investor relations, tax. treasury and other services. Following this offering, we expect IAC to continue to provide many of these services for a fee pursuant to the services agreement described in 'Certain relationships and related party transactions.' While we expect to incur additional expenses as a public company, including pur