From years when I had actual weekly charts (as opposed to the earlier years for which I've retroactively created year-end surveys at
Music of a Lifetime). The exceptions are 2003 through 2005, when I had only year-end charts, not weekly charts:
1978: Goodbye Girl, David Gates
1979: Love Is the Answer, England Dan and John Ford Coley
1980: All Out of Love, Air Supply
1981: The One That You Love, Air Supply
1982: Hard to Say I'm Sorry, Chicago
1983: I Won't Hold You Back, Toto
1984: Against All Odds (Take a Look at Me Now), Phil Collins
1985: We Are the World, USA for Africa
1986: The Greatest Love of All, Whitney Houston
1987: In Too Deep, Genesis
1988: Never Gonna Give You Up, Rick Astley
1989: Hey Baby, Henry Lee Summer
1990: Love Takes Time, Mariah Carey
1991: Something to Talk About, Bonnie Raitt
1992: End of the Road, Boyz II Men
1993: Love Is, Vanessa Williams/Brian McKnight
1994: Streets of Philadelphia, Bruce Springsteen
1995: I Know, Dionne Farris
1996: Because You Loved Me, Celine Dion
1997: I Believe I Can Fly, R. Kelly
1998: Frozen, Madonna
1999: In a Rush, Blackstreet
2000: Nobody Else in the World But You, Don Henley
2001: Drops of Jupiter (Tell Me), Train
2002: Wish I Didn't Miss You, Angie Stone
2003: Whenever I Say Your Name, Sting featuring Mary J. Blige
2004: Over and Over, Nelly featuring Tim McGraw
2005: The One I Love, David Gray
2006: The Heart of the Matter, India.Arie
2007: If You're Gonna Leave, Emerson Hart
2008: Stamp Your Feet, Donna Summer
2009: Smile, Uncle Kracker
2010: California Gurls, Katy Perry featuring Snoop Dogg
2011: Fool for You, Cee-Lo Green
2012: I Won't Give Up, Jason Mraz
2013: Safe and Sound, Capital Cities
2014: Stay With Me (Remix), Sam Smith featuring Mary J. Blige
2015: Ghosttown, Madonna
2016: Water Under the Bridge, Adele
2017: Million Reasons, Lady Gaga
2018: Nether Lands, Donna Summer