Well, youngster...
I found some info at this website...it's not mentioned here, but I presume they didn't change any stats retroactively when they changed the sac fly rule.
Baseball Library.com - Baseball Rules Chronology1908
The sacrifice fly rule is adopted, exempting the batter from an at-bat when a run scores after a catch.
1926
The sacrifice fly rule is amended to exempt a batter from an at-bat when a runner advances from first to second or second to third as well as on scoring.
1931
The sacrifice fly is eliminated.
1939
A batter is credited with a sacrifice fly and not charged with a time at bat if he hits a fly ball that is caught and a runner scores on the catch. This rule lasted only a year.
1940
A batter is no longer credited with a sacrifice fly.
1954
A batter is credited with a sacrifice fly and not charged with a time at bat if he hits a fly ball and the runner scores on the catch.
[ July 15, 2002: Message edited by: Joe in Philly ]