A: The World Tourism Association is a U.N. agency that promotes tourism (http://www2.unwto.org/). They issue an annual report and the latest report is from 2015. The report has a “By the Numbers” section which breaks down tourist arrivals by continent on page 15 (http://cf.cdn.unwto.org/sites/all/files/pdf/annual_report_2015_lr.pdf). According to this, Europe accounted for 51% of the tourism "market ", with 609M arrivals. Page 17 of the report includes sources used for the section; there is a Compendium of Tourism Statistics which compiles the information from individual countries. The latest available is the 2016 Compendium which has data from 2010-2014 on inbound and outbound tourism for individual countries. Unfortunately, the Compendium is available for purchase only. I checked WorldCat to see if other editions are readily available. The Hathi Trust lists the availability of various editions (https://catalog.hathitrust.org/api/volumes/oclc/15666615.html) The latest edition available for limited search only is from 2008, via the University of Minnesota libraries.
Without access to the full Compendium, it’s hard to find figures on the tourism industry across multiple countries. Also, presumably the U.N. collects data only from member states (Quora has a thread on which countries/territories are not U.N. members at https://www.quora.com/United-Nations-What-countries-are-not-part-of-the-UN).
However, I found figures on the countries mentioned below from:
Population & GDP (Gross Domestic Product) Per Capita figures in U.S. dollars are taken from the World Factbook at https://www.cia.gov/library/publications/the-world-factbook/.
The World Bank collects data on tourism receipts by country and this information is available at http://data.worldbank.org/indicator/ST.INT.RCPT.CD (note: numbers are reported in millions of U.S. $)
Australia
Population: 22,992,654
GDP Per Capita: $47,600
Tourism Receipts 2014 in USD millions: $31,117
Fiji
Population: 915,303
GDP Per Capita: $9,100
Tourism Receipts 2014 in USD millions: no data
Maldives
Population: 392,960
GDP Per Capita: $14,900
Tourism Receipts 2014 in USD millions: $2,645
New Zealand
Population 4, 474,549
GDP Per capita 2015: $36,100
Tourism Receipts 2014 in USD millions: $8,400
Samoa
Population: 198,926
GDP Per Capita: $5,200
Tourism Receipts 2014 in USD millions: $146
United Kingdom
Population: 64, 430,428
GDP Per Capita: $41,500
Tourism Receipts 2014 in USD millions: $62,830
United States
Population: 323,995,528
GDP Per Capita:$56,100
Tourism Receipts 2014 in USD millions: $220,757