The LDS Church grew rapidly after World War II and became a worldwide organization as missionaries were sent across the globe. The church doubled in size every 15 to 20 years, and by 1996, there were more Mormons outside the United States than inside. In 2012, there were an estimated 14.8 million Mormons, with roughly 57 percent living outside the United States. It is estimated that approximately 4.5 million Mormons – roughly 30% of the total membership – regularly attend services. A majority of U.S. Mormons are white and non-Hispanic (84 percent). Most Mormons are distributed in North and South America, the South Pacific, and Western Europe. The global distribution of Mormons resembles a contact diffusion model, radiating out from the organization's headquarters in Utah. The church enforces general doctrinal uniformity, and congregations on all continents teach the same doctrines, and international Mormons tend to absorb a good deal of Mormon culture, possibly because of the church's top-down hierarchy and a missionary presence. However, international Mormons often bring pieces of their own heritage into the church, adapting church practices to local cultures.