Phil;
Here are a couple of links which puts us at the top of spending. Nationmaster stats are all sourced and there are a LOT off them for education. You can actually research where we stand in just about any statistic you are interested in. Your link was as a percent of the gnp which is not an actual dollar amount. My claim was that we are spending more money/dollars (something between 7 and 8 grand per kid per year). I find all the statistics, however with interest and they are worth study.

http://www.nationmaster.com/graph/edu_spe_per_sec_sch_stu-spending-per-secondary-school-student
http://www.nationmaster.com/graph/edu_spe_per_pri_sch_stu-spending-per-primary-school-student