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## Revenue 

In 2018, revenue increased $16.6 million, or 0.1%, to $15,290.2 million from $15,273.6 million in 2017. Changes in foreign exchange rates increased revenue $85.1 million, acquisition revenue, net of disposition revenue, reduced revenue $326.6 million, and organic growth increased revenue $404.2 million. The impact of changes in foreign exchange rates increased revenue 0.6%, or $85.1 million, primarily resulting from the strengthening of the Euro and British Pound, against the U.S. Dollar, partially offset by the weakening of the Brazilian Real, Russian Ruble and Australian Dollar against the U.S. Dollar. 

The components of revenue change in the United States (“Domestic”) and the remainder of the world (“International”) were (in millions): 

<img src='content_image/1059226.jpg'>

The components and percentages are calculated as follows: 

• The foreign exchange impact is calculated by translating the current period’s local currency revenue using the prior period average exchange rates to derive current period constant currency revenue (in this case $15,205.1 million for the Total column). The foreign exchange impact is the difference between the current period revenue in U.S. Dollars and the current period constant currency revenue ($15,290.2 million less $15,205.1 million for the Total column). 

• Acquisition revenue is calculated as if the acquisition occurred twelve months prior to the acquisition date by aggregating the comparable prior period revenue of acquisitions through the acquisition date. As a result, acquisition revenue excludes the positive or negative difference between our current period revenue subsequent to the acquisition date and the comparable prior period revenue and the positive or negative growth after the acquisition is attributed to organic growth. Disposition revenue is calculated as if the disposition occurred twelve months prior to the disposition date by aggregating the comparable prior period revenue of dispositions through the disposition date. The acquisition revenue and disposition revenue amounts are netted in the table. 

• Organic growth is calculated by subtracting the foreign exchange rate impact, and the acquisition revenue, net of disposition revenue components from total revenue growth, excluding the impact of the adoption of ASC 606. 

• The impact of the adoption of ASC 606 is discussed above in the Accounting Changes section. 

• The percentage change is calculated by dividing the individual component amount by the prior period revenue base of that component ($15,273.6 million for the Total column). 

Revenue and organic growth, excluding the impact of ASC 606, in our principal regional markets were (in millions): 

<img src='content_image/1059234.jpg'>

Revenue in Europe, which includes our primary markets of the U.K. and the Euro Zone, increased $247.5 million. Revenue in the U.K., representing 9.5% of total revenue, increased $60.3 million. Revenue in Continental Europe, which comprises the Euro Zone and the other European countries, representing 19.1% of total revenue, increased $187.2 million. 

In North America, modest growth in the United States was offset by a decrease in revenue primarily resulting from the impact of the adoption of ASC 606, the disposition of our specialty print media business in the second quarter of 2017 and negative performance in Canada. Organic revenue growth in the United States was led by our CRM Consumer Experience, healthcare, advertising and media and public relations businesses, and was partially offset by a decrease in our CRM Execution & 

