I agree that for the most part 100m performances haven’t increased to inhuman performance levels. However, I think it’s fair to say that the top 10 performances have and they have skewed the data downward. I also posted earlier that I believe the steriod era hit its height in the mid 90’s. Look at the trend of sub 10.25’s after BALCO broke in 2003, the number of sub 10.25’s dropped dramatically till 2005 and started trending upwards again in 2006. We should look at what causes the rise and fall of these numbers.