Dirty Weasel
Footballguy
The links below will take you to my off-season work. The first is an Excel spreadsheet. Tab 1 is every carry since 1978, by every position. Tab 2 is every catch by RB's only. Tab 3 is every rushing TD by every position. Tab 4 is how many 200+ touch RB's there were in each year since 1978, along with all the 400+ touch RB's (by number, name, and year). Playoff game stats are not included in this. Also, the second link is a Powerpoint file, showing a timeline chart of how the RB carries, catches, and TD's have been distributed since 1978 (I only charted RB1 thru RB5). Use the files for whatever they are worth to you. Also, if you spot a trend, feel free to share.
http://www.sendspace.com/file/qgr2e4
http://www.sendspace.com/file/thdyah
http://www.sendspace.com/file/qgr2e4
http://www.sendspace.com/file/thdyah