we have some smart people who worked on the report on the side and john mcclelland to help answer questions. john is the head of our tax analysis division. so, if you don't mind, would you please state your name and news organization when asking a question. >> paul congressional quarterly. there used to be sort of a rule of thumb over the previous 40 years revenue had averaged 18% and spending averaged 20%. but now over the next ten years revenue 17% and spending 20%, is that correct? >> that's right. >> okay. and do you know at what point that changed and why it changed, spending stay about the same, but it looks-- well, but over the past 50 years revenue has dropped from 18 to 17 average? >> well, actually the recent drop, the question was that the tax act. and we expect that the revenue projections are going to grow back to above their 50-year historical average by the end of the 10-year period and get back to higher than normal revenue levels. >> the great recession play a part in reducing past revenues, which helps bring the past average from 18% to 17%? >> yeah, that seems like-- ther