Looks to be between 1986 and 1988. The ending when the onscreen lettering appeared shows an image of Bozo over his name. That premiered during the 25th Anniversary Special which was in 1986. I would even narrow it down to the 1986-87 season because the music sounds like it's coming a live band (which was a group of three at the time) and not synthesizer that Andy Mitran used when he joined the show in 1987.

@@BrianRetro Ok, thanks for your help.