2010, together contributing 42% of national research expenditure. In 2010, more than one quarter of R&D was concentrated in California (28.1%), ahead of Massachusetts (5.7%), New Jersey (5.6%), Washington State (5.5%), Michigan (5.4%), Texas (5.2%), Illinois (4.8%), New York (3.6%) and Pennsylvania (3.5%). Seven states (Arkansas, Nevada, Oklahoma, Louisiana, South Dakota and Wyoming) devoted less than 0.8% of GDP to R&D. California is home to Silicon Valley, the name given to the area hosting the leading corporations and start-ups in information technology. This state also hosts dynamic biotechnology clusters in the San Francisco Bay Area, Los Angeles and San Diego. The main biotechnology clusters outside California are the cities of Boston/Cambridge, Massachusetts, Maryland, suburban Washington, DC, New York, Seattle, Philadelphia, and Chicago. California supplies 13.7% of all jobs in science and engineering across the country, more than any other state. Some 5.7% of Californians are employed in these fields. This high share reflects a potent combination of academic excellence and a strong business focus on R&D: the prestigious Stanford University and University of California rub shoulders with Silicon Valley, for instance. In much the same way, Route 128 around Boston in the state of Massachusetts is not only home to numerous high-tech firms and corporations but also hosts the renowned Harvard University and Massachusetts Institute of Technology. New Mexico's high research intensity can be explained by the fact that it hosts the Los Alamos National Laboratory. Maryland's position may reflect the concentration of federally funded research institutions there. Washington State has a high concentration of high-tech firms like Microsoft, Amazon and Boeing and the engineering functions of most automobile manufacturers are located in the state of Michigan. Research spending by multinational corporations The federal government and most of the 50 states that make up the United States offer tax credits to particular industries and companies to encourage them to engage in research and development (R&D). Congress usually renews a tax credit every few years. According to a survey by The Wall Street Journal in 2012, companies do not factor in these credits when making decisions about investing in R&D, since they cannot rely on these credits being renewed. In 2014, four U.S. multinational corporations figured in the Top 50 for the volume of expenditure on R&D: Microsoft, Intel, Johnson & Johnson and Google. Several have figured in the Top 20 for at least ten years: Intel, Microsoft, Johnson & Johnson,