"The Jokes Club" joke

In a small town there existed a jokes club. They met once a week and told each
other jokes. It turned out that the same jokes were repeated on and on. In order
to be able to tell more jokes in an evening the club decided to give a number to
each joke. The members had to learn the numbers and so they only had to tell the
number of the joke.
One day a visitor was invited to join a session.
Somebody shouted, "94!" Twenty seconds of laughter followed.
"123!" Ten seconds of laughter.
"74!" Twelve seconds of laughter.
And so on it went all the evening. The visitor was somehow puzzled. At some
point he decided also to shout a number, "365!" There followed more than five
minutes of laughter. The visitor was even more puzzled.
After the audience came back to silence, he asked the man next to him, "Why were
you laughing such a long time?"
The man answered, "It was the first time we heard this joke."