I borrowed these numbers from Fangraphs:

This is a list of the average velocity of starter's fastballs yearly starting in 2002. This is the first year that I saw that Fangraphs had this type of data. I am guessing that 2002 is still the 'steroids' era since testing had not yet begun.

Code:

YEAR 90+% 93+%
2002 48% 11%
2003 46% 4%
2004 45% 10%
2005 42% 7%
2006 51% 13%
2007 57% 14%
2008 66% 16%
2009 73% 21%
2010 71% 16%

The second column (90+%) is the percentage of starters who, for that particular year, had an average fastball of at least 90 MPH. In 2002 it was just less than half at 48%. By 2009 it was markedly higher as almost 3 out of 4 starters had an average fastball of 90 MPH.

The third column (93+%) is the percentage of starters who, for that particular year, had an average fastball of at least 93 MPH. In 2002 it was about one out of every ten. By 2009 it had jumped to about one out of every five.

Here is a link in case anyone wants to check out the numbers for themselves.

http://www.fangraphs.com/leaders.asp...n=2010&month=0
I don't know where Fangraphs got their data from - maybe Game Day.

And I believe the math is right. It seems clear (unless I made a mistake somewhere) that pitchers are indeed throwing with more velocity these days than they did during the 'steroids' era.