Why Bob dylan is late 5 months brought the Nobel Prize?

Last year on December 10, Bob dylan's friends "godmother" punk Patty Smith award on behalf of the dead. According to foreign media on March 29th, the Swedish academy announced, Bob dylan finally decided to accept the 2016 Nobel Prize for literature in Stockholm this weekend. The award-winning speech, however, he does not live, but will send out a winning speech recording to the Swedish academy. Previously, including 2013 Alice munroe, etc...