This Judo smurf is from recent production.
Schleich still produces smurfs (right now it's just about 40 smurfs) each year and Judo smurf was part of the current production until recently (or may still be part of the production now).
Since your smurf has the markings of Germany instead of W. Germany, I am 100% sure that it is from the recent production. Like others said...the year 1981 is the year Schleich first produced the smurf. As far as I know, the smurfs will always show the year of the year that mold was made, so recent molds (like the actors) will have recent years on them
It doesn't really affect the value of the smurf. Since it's a current production line smurf it's not really one of the rarer smurfs no matter if it was actually made in 1981 or was made in 2009.
Schleich came out with a new marking in 2009 (which includes the full Schleich address) so since your's doesn't have that new marking, I'd say it was made sometimes before 2009...but I don't think you will be able to pinpoint the exact year this particular figurine was made. Actually there is a way to pinpoint it going by the size of the CE and that there is no "made in China" on it..but I personally haven't really bothered going that deeply into the markings yet.
Hope this helps
