We don't have a specific dollar figure. We've been saying that the investment level in the 1950s and 1960s was one that is appropriate to be sustained. It's not a particular number of billions of dollars a year. We don't have that kind of precision in our analysis. I certainly would point out that roughly 5% of GDP now is an awful lot bigger number than 5% of GDP in 1960, and appropriately so. That scale of investment now is necessary in order to bring infrastructure back to a place of economic competitiveness.
On May 12th, 2015. See this statement in context.