1. Find data for US agricultural production and US GDP for the years 1950, 1960, 1970, 1980, 1990, and 2000.
2. What are the current (say 2007 or later) shares of US GDP for agricultural production, the food industry, and the food and fiber sector?
以上两个数据,请大神指点,需要数据和数据来源,谢谢!