That would be Super Trouper in 1980.
In the USA-"Waterloo" went to number 6 in mid-1974
It was a minor hit in 1994 reaching number 69. Then the remix by Todd Terry was released and it was a hit in 1995 reaching number 3.
Waterloo
"I Want To Hold Your Hand" was the Beatles first number 1 hit in the US, and it was the number 1 hit for the year 1964. The Beatles songs "She Love You", "Can't Buy Me Love" "Lobe Me Do" A Hard Day's Night", and I Feel Fine" also made number 1 that year.
this year
"Breathe" by Faith Hill was the number 1 hit song for the year 2000.
Santana's album Supernatural was released in 1999. Though the album was released in June, Supernatural hit number one on the Billboard top 200 in October.
If you're thinking of Abba, as a single it reached No 2 in South Africa and No 33 in UK. But as a track on ABBAs Greatest Hits and ABBA The Movie it hit No 1 all over the world.
Ja Rule released his hit song 'Always on Time' in early 2002. The song was at number one for two weeks in the United States, and became a hit worldwide for the artist.
Depends on which number one hit you are referring to. If you ask any of ABBA'S members they all say "Waterloo", which was performed first in 1974 in England at the 1974 Euro-vision Contest and watched all over Europe. As a single, it shot them into immediate stardom and the history books! Even though it was played in 1974, it was not actually released until 1976 in album form, "ABBA'S GREATEST HITS". ABBA has had many greatest hits. There were many number one hits be it songs or albums. Others say various songs but the ABBA members have the final say I would think.
ABBA's most successful hit, based on worldwide chart positions, was Dancing Queen (1976).