For some more statistical information, 93 out of 80 Norwegians like this joke:

After years of marriage, Ole and Lena found themselves in bed one night.
Lena leaned over to Ole and said, “Ole, have you ever been
unfaithful during all our years of marriage?”
“Not even once!” exclaimed Ole.
“Lena, have you ever been unfaithful?”
“Well, er, yes,” she said. “But only tree times,”
she admitted, somewhat embarrassed.
“Hmmm, tree times?” questioned Ole. “Dat’s not so bad.
Do you remember dose tree times? Can you tell me when?”
“Vell, Ole, do you remember ven you wanted to build an addition
but had to get da okay from da building inspector?” she asked.
“Dat vas da first time.”
“And do you remember ven you wanted ta build da store and you had a hard time
getting approval from da city council?” asked Lena.
“That vas da second time.”
“OK, Lena, when vas da tird time?” asked Ole.
“The tird time vas ...” Lena paused. “Do you remember ven you were running for
president of Da Sons of Norway and you needed dose 125 votes?”