Which Industries Spend More as a Percentage of Sales on Reseach and Development?

The healthcare industry, as a whole, puts a larger percentage (in terms of total sales) of capital back into research and development than just about every other major industry.  This is an area where the U.S. still maintains a Comparative Advantage (and HERE) relative to the rest of the world.  Are we (politicians/policy-makers/industry) doing enough to make sure it stays this way?...