percentage of people who identified as having no religious affiliation has increased from 8.7% in 1971 to 42.9% in 2021. A small minority of the population are Muslims (2.5%), Buddhists (2.2%) and Hindus (2.0%). Economy Western Australia's economy is largely driven by extraction and processing of a diverse range of mineral and petroleum commodities. The structure of the economy is closely linked to these natural resources, providing a comparative advantage in resource extraction and processing. As a consequence: Western Australia contributes an estimated 58% of Australia's Mineral and Energy Exports, potentially earning up to 4.64% of Australia's total GDP. Gross state product per person ($97,940 in 2017–18) is higher than any other state and well above the national average ($73,267). Diversification (i.e. a greater range of commodities) over the past 15 years has provided a more balanced production base and less reliance on just a few major export markets, insulating the economy from fluctuations in world prices to some extent. Finance, insurance and property services and construction have grown steadily and have increased their share of economic output. Recent growth in global demand for minerals and petroleum, especially in China (iron-ore) and Japan (for LNG), has ensured economic growth above the national average. In 2019 Western Australia's overseas exports accounted for 46% of the nation's total. The state's major export commodities included iron-ore, petroleum, gold, alumina, nickel, wheat, copper, lithium, chemicals and mineral sands. Western Australia is the world's largest iron-ore producer (32% of the world's total), and extracts 67% (6% of world production) of Australia's 324 tonnes of gold. It is a major world producer of bauxite, which is processed into alumina at four refineries providing 11% of total world production. Diamonds are extracted at the world's largest diamond mine in the far north Kimberley region. Coal mined at Collie is the main fuel for baseload electricity generation in the state's south-west. Agricultural production in WA is a major contributor to the state and national economy. Although tending to be highly seasonal, in the period 2010–2019 wheat production in WA has averaged nearly 10 million tonnes ($2.816 billion in 2019), accounting for half the nation's total and providing $2–3 billion in export income. Other significant farm output includes wool, beef, lamb, barley, canola, lupins, oats and pulses. There is a high level of overseas demand for live animals from WA, driven mainly by southeast Asia's feedlots and Middle Eastern