Checkpoint: Ecology and Population

According to the U.S. Census Bureau's World Population Clock it states that the population in the U.S. as of 01:55 on October 10, 2009 is 307,659,604 and the world total is 6,789,485,571. I rechecked the numbers at 02:17 GMT same day the U.S. is total now 307,659,727 and the world total 6,789,488,913. According to these numbers, the population in the U.S. grew by 123 people in just 22 minutes and the world population grew by 3342 people in the same 22 minutes. The internet states that our world population is growing at about 9,000 people per hour or 220,000 people per day, but if you go by the World Population's Clock, the world population is growing at roughly 10,026 people per hour or 240,624 people per day. Using these figures the U.S, population should grow by 3,232,440 in one year and the world population should grow by 87,827,760 per year.