1941: Daddy by Sammy Kaye

#1 for 7 weeks

1942: Jingle Jangle Jingle by Kay Keiser

#1 for 8 weeks

1943: You’ll Never Know by Dick Haymes

#1 for 4 weeks

1944: Swinging On A Star by Bing Crosby

#1 for 9 weeks

1945: Sentimnental Journey by Les Brown and Doris Day

#1 for 9 weeks

1946: The Gypsy by The Ink Spots

#1 for 10 weeks

1947: Smoke! Smoke! Smoke! (The Cigarette) by Tex Ritter

#1 for 6 weeks

1948: Woody Wood-Pecker by Kay Kyser

#1 for 6 weeks

1949: Riders in the Sky: A Cowboy Legend by Vaughn Monroe

#1 for 11 weeks

1950: The Third Man Theme by Anton Karas

#1 for 11 weeks

1951: Come On-A My House by Rosemary Clooney

#1 for 6 weeks

1952: Auf Wiederseh’n Sweetheart by Vera Lynn

#1 for 9 weeks

1953: The Song From Moulin Rouge (Where Is Your Heart) by Percy Faith

#1 for 10 weeks

1954: Sh-Boom by The Crew Cuts

#1 for 7 weeks

1955: Rock Around The Clock by Bill Haley

#1 for 8 weeks

1956: Heartbreak Hotel by Elvis Presley

#1 for 7 weeks

1957: Teddy Bear by Elvis Presley

#1 for 6 weeks

1958: Purple People Eater by Sheb Wooley

#1 for 6 weeks

1959: The Battle Of New Orleans by Johnny Horton

#1 for 6 weeks

1960: Itsy Bitsy Teenie Weenie Yellow Polka Dot Bikini by Brian Hyland

#1 for 1 week

1961: Tossin’ and Turnin’ by Bobby Lewis

#1 for 7 weeks

1962: The Locomotion by Little Eva

#1 for 1 week

1963: It’s My Party by Lesley Gore

#1 for 2 weeks

1964: I Get Around by The Beach Boys

# 1 for 2 weeks

1965: Satisfaction by The Rolling Stones

#1 for 4 weeks

1966: Wild Thing by The Troggs

#1 for 2 weeks

1967: Respect by Aretha Franklin

#1 for 2 weeks

1968: Mrs. Robinson by Simon And Garfunkel

#1 for 3 weeks

1969: Get Back by The Beatles

#1 for 5 weeks

1970: American Woman by The Guess Who

1971: I Feel The Earth Move by Carole King

#1 for 5 weeks

1972:Lean On Me by Bill Withers

#1 for 3 weeks

1973: Bad, Bad Leroy Brown by Jim Croce

#1 for 2 weeks

1974: Rock Your Baby by George McCrae

#1 for 3 weeks

1975: The Hustle

1976: Shake Your Booty by KC & The Sunshine Band

#1 for 1 week

1977: The Best Of My Love by The Emotions

#1 for 5 weeks

1978: Shadow Dancing by Andy Gibb

#1 for 7 weeks

1979: Hot Stuff by Donna Summer

#1 for 3 weeks

1980: Funky Town by Lipps Inc

#1 for 4 weeks

1981: Endless Love by Diana Ross and Lionel Richie

#1 for 9 weeks

1982: Eye Of The Tiger by Survivor

#1 for 6 weeks

1983: Every Breath You Take by The Police

#1 for 8 weeks

1984: When Doves Cry by Prince

#1 for 5 weeks

1985: Everybody Wants To Rule The World by Tears For Fears

#1 for 2 weeks

1986: Papa Don’t Preach by Madonna

#1 for 2 weeks

1987: I Wanna Dance With Somebody by Whitney Houston

#1 for 2 weeks

1988: Dirty Diana by Michael Jackson

#1 for 1 week

1989: Right Here Waiting by Richard Marx

#1 for 3 weeks

1990: Step By Step by The New Kids On The Block

#1 for 3 weeks

1991: Summertime by DJ Jazzy Jeff and Will Smith

#1 for 1 week (Rap and R&B chart)

1992: Baby Got Back by Sir Mix A Lot

#1 for 5 weeks

1993: That’s The Way Love Goes by Janet Jackson

#1 for 8 weeks

1994: I Swear by All 4 One

#1 for 11 weeks

1995: Waterfalls by TLC

#1 for 7 weeks

1996: The Macarena

#1 for 14 weeks

1997: I’ll Be Missing You by Puff Daddy

#1 for 11 weeks

1998: The Boy Is Mine by Brandy & Monica

#1 for 13 weeks

1999: Livin La Vida Loca by Ricky Martin

#1 for 5 weeks

2000: It’s Gonna Be Me by NSYNC

#1 for 2 weeks

2001: Lady Marmalade by Christina Aguilera, Lil Kim, Mya, and Pink

#1 for 5 weeks

2002: Hot In Herre by Nelly

#1 for 7 weeks

2003: Crazy In Love by Beyonce

#1 for 8 weeks

2004: Yeah by Usher

#1 for 12 weeks

2005: We Belong Together by Mariah Carey

#1 for 14 weeks

2006: Promiscuous by Nelly Furtado

#1 for 6 weeks

2007: Umbrella by Rihanna

#1 for 7 weeks

2008: I Kissed A Girl by Katy Perry

#1 for 7 weeks

2009: I Gotta Feeling by The Black Eyed Peas

#1 for 12 weeks

2010: ???

My guesses: OMG by Usher, Airplanes by B.o.B. and Hayley Williams, or Alejandro by Lady Gaga.