Since the invention of the integrated circuit, Silicon Valley and growth have been nearly synonymous. In 1959 there were roughly 18,000 high-technology jobs in the area. By 1971 there were approximately 117,000 such jobs, and in 1990 nearly 268,000 filled positions. From 1992 to 1999 Silicon Valley added more than 230,000 jobs (an increase of 23 percent) and accounted for roughly 40 percent of Californiaâs export trade. To fill the growing need for high-technology workers, particularly engineers, the United States relaxed immigration quotas for aliens with special training, and the region experienced a large influx of workers from India and China. From 1975 to the 1990 U.S. census, the foreign-born population of Santa Clara county more than doubled, to 350,000. By the 21st century the Valleyâs population had grown to more than two million; San Jose alone grew from roughly 200,000 in 1960 to more than 900,000 by centuryâs end to become the largest city in northern California. Electronics, computers, and computer software made the regionâs wealth, but much of that wealth was absorbed by real estate: by 2000 the median price of a home in Santa Clara county was more than twice the national median for major metropolitan areas.