estimated 3.1% of the irreligious were atheist. With the publication of a study by the Public Religion Research Institute in 2020, Christianity spread among Protestantism, Catholicism, and non-mainstream Christians including Mormonism and the Jehovah's Witnesses were approximately 64% of the adult population. The religiously unaffiliated were determined to be an estimated 30% of the total adult population according to the Public Religion Research Institute. Additionally, the Association of Religion Data Archives reported that the single largest denominations were the following: the Catholic Church (124,208); United Church of Christ (11,882); and the United Methodist Church (9,652). Non-denominational Protestants numbered 29,830. Economy In 2016, Vermont had a total employment of 262,705, and the total employer establishments were 21,174. In 2019, VermontBiz reported a WalletHub ranking of Vermont 43rd as place to start a business, citing Vermont as 49th in average growth of small businesses and 50th in the availability of human capital. CNBC ranked Vermont 32nd as a place to do business in 2018, citing access to capital as the largest impediment. While U.S. News ranked Vermont 37th for "business environment", it ranked it 18th for employment in 2019.Forbes magazine as the 42nd best state in which to do business in 2015, 32nd in 2007, and 30th in 2006. As of 2017, Vermont's gross regional domestic product (GDP) was , making it the second smallest among the 50 states. Its per capita GDP was $51,600, ranking it 34th among the states. Components of GDP were: Government $3 billion (13.4%) Real estate, rental, and leasing $2.6 billion (11.6%) Durable goods manufacturing $2.2 billion (9.6%) Health care and social assistance $2.1 billion (9.4%) Retail trade $1.9 billion (8.4%) Finance and insurance $1.3 billion (5.9%) Construction $1.2 billion (5.5%) Professional and technical services $1.2 billion (5.5%) Wholesale trade $1.1 billion (5.1%) Accommodations and food services $1 billion (4.5%) Information $958 million (4.2%) Non-durable goods manufacturing $711 million (3.1%) Other services $563 million (2.4%) Utilities $553 million (2.4%) Educational services $478 million (2.1%) Transportation and warehousing $484 million (2.1%) Administrative and waste services $436 million (1.9%) Agriculture, forestry, fishing, and hunting $375 million (1.6%) Arts, entertainment, and recreation $194 million (.8%) Mining $100 million (.4%) Management of companies $35 million (.2%) Canada was Vermont's largest foreign trade partner in 2007. The state's second-largest foreign trade partner was Taiwan. The state had worth of commerce with Quebec. One measure of economic activity in Vermont is retail sales.