AUSTRALIA AT A GLANCE Population: 18 million Most populous state: New South Wales, 4 million. Workforce: 9 million. Homosexual population: No official figures, but gay community estimates 1 in 10 Australian adults are homosexual. There are openly gay communities in every state capital, except Darwin. Largest homosexual community: Sydney, 30 percent in inner city suburbs of Darlinghurst and Surry Hills. Gay-hate killings in New South Wales: 23 since 1990. Gay bashings: 190, 1993-94; 170, 1994-95. Police survey showed lesbians six times more likely to be physically assaulted than heterosexual women. For gay men the figure is 4-1. Sydney hosts the world's biggest gay and lesbian Mardi Gras and month-long gay festival each February, which regularly attracts 500,000 spectators and participants from all over the world. Estimated annual revenue from these activities $30 million.