EU in 2004, the annual number of immigrants doubled by 2006 and increased by half yet again by 2009. In 2007, Slovenia had one of the fastest growing net migration rates in the European Union. Emigration Between 1880 and 1918 (the period covering World War I), many men left Slovenia to work in mining areas in other nations. The United States in particular has been a common choice for emigration, with the 1910 US Census showing that there were already "183,431 persons in the USA of Slovenian mother tongue". However, there may have been many more, because a good number avoided anti-Slavic prejudice and "identified themselves as Austrians." Favorite localities before 1900 were Minnesota, Wisconsin, Michigan, as well as Omaha, Nebraska, Joliet, Illinois, Cleveland, Ohio, and rural areas of Iowa. After 1910, they settled in Utah (Bingham Copper Mine), Colorado (especially Pueblo), and Butte, Montana. These areas attracted many single men (who often boarded with Slovenian families). After locating work and having sufficient money, the men sent back for their wives and families to join them. Religion Before World War II, 97% of the population declared itself Catholic (Roman Rite), around 2.5% as Lutheran, and around 0.5% of residents identified themselves as members of other denominations. After 1945, the country underwent a process of gradual but steady secularization. After a decade of persecution of religions, the Communist regime adopted a policy of relative tolerance towards churches. After 1990, the Catholic Church regained some of its former influence, but Slovenia remains a largely secularized society. According to the 2002 census, 57.8% of the population is Catholic. In 1991, 71.6% were self-declared Catholics which means a drop of more than 1% annually. The vast majority of Slovenian Catholics belong to the Latin Rite. A small number of Greek Catholics live in the White Carniola region. The 2018 Eurobarometer data shows 73.4% of population identifying as Catholic that fell to 72.1% in the 2019 Eurobarometer survey. According to the Catholic Church data, the Catholic population fell from 78.04% in 2009 to 72.11% in 2019 Despite a relatively small number of Protestants (less than 1% in 2002), the Protestant legacy is historically significant given that the Slovene standard language and Slovene literature were established by the Protestant Reformation in the 16th century. Primoz Trubar, a theologian in the Lutheran tradition, was one of the most influential Protestant Reformers in Slovenia. Protestantism was extinguished in