Since we were really just talking about movies, the '90s were different than the '80s in some important ways and some key movies came out within a few years of the turn of the decade, but nowadays the boxoffice it totally dominated by franchise blockbusters, CG "all ages" animated movies, and live action Disney. There's almost nothing in the last 10 years in the top 10 movies, The Martian and Gravity are exceptions but those are both CG spectacles, just hard SF rather than science fantasy (and they're not part of a franchise). You can also find a couple musicals/musician Biopics like Bohemian Rhapsody and Mama Mia!
Actually the biggest movies of both 1980 and 1999 are Star Wars movies. Most of the big 1980 movies are comedies. 1999 has more stuff that resembles the biggest modern hits (although you can argue they wouldn't be that unfamiliar to a 1980 audience, there's a James Bond movie and hte Mummy, which is an Indiana Jones knockoff) but they also have an Austin Powers movie, Notting Hill, American Beatuy, and The Sixth Sense. None of those are like what would be a contemporary top 10 movie. To find the most recent top 10 comedies you can go back to 2011 and 2009 for the two Hangover movies.