State Department travel advisories have alerted tourists to the dangers of certain areas of the country. Tourist guides and web-based sources There are a number of useful print guide books to tourist sites in Mexico, including the Michelin Green Guide, Lonely Planet, Rough Guide, Fodor's, Frommer's, and Baedeker's. The Mexican tourist bureau has a website with many resources. Travel websites vary in quality and usefulness. Tourism industry competitiveness In the 2017 Travel and Tourism Competitiveness Index (TTCI) report, which is a measurement of the factors that make it attractive to developing business in the travel and tourism industry of individual countries, Mexico was ranked 22nd place in the world's ranking, with tourist service infrastructure rank 43; price competitiveness 63; health and hygiene, 72; safety and security, 113; environmental sustainability, 116. Statistics Most visitors arriving to Mexico by air for tourism come from the following countries: Local Effects Economic Effects The Mexican government has often had a hand in the development of the country's tourist sector. One reason for this was, and still is, tourism's potential to improve the economy, as tourists spend money on accommodations, recreation, food and souvenirs. In the 1920s, the government organized studies of the economy and tourism competitors, collaborated with private companies, and created a national tourism agency in order to capitalize on the economic potential of tourists, especially those from the United States. The tourism industry in 2018 was about 8.7% of Mexico’s GDP and brought the country 215.5 billion Mexican pesos (or 10.8 billion U.S. dollars) in export earnings. That same year, it also provided jobs for over 2.3 million people, which is 6% of the total employment in the nation. Social Effects In the early 20th century, the development of tourism may have increased a sense of national unity and pride among Mexicans because promoting the industry required them to celebrate the unique environment, history and culture that make the country a desirable place to visit. Much of the tourist economy is focused on large tourist centers and resort areas, some of which were set up by the government itself, such as Cancún in 1970. People from around Mexico migrate to these centers in search of employment. In many cases, the available jobs have allowed women to gain more economic independence. In other instances, where migrants leave their families to find work outside their towns, the move can disrupt family dynamics and other