If 17,000 sexual offenses are reported, and the police estimates that only 23 are reported, the actual number of sexual offences is around 80,000:
"According to the National Crime Prevention Council (National Council) only about 23 percent of sex crimes in Sweden are reported to the police. Last year police reported over 6,000 rapes and almost 17,000 sexual offenses. ...
In 2012, about 87,100 assaults were reported in Sweden. The number of reportings have increased over a ten year period."