[["If the first year of \u201cthe\u201d decade starts on a year whose number ends in 1, that decade ends on the last day of the next year whose number ends in 0.  Like 1901, 1902, 1903, 1904, 1905, 1906, 1907, 1908, 1909, 1910.  See?\n\nCount \u2018em.  There are ten.  That makes a decade. But any ten, no gaps, is too.", 35.0], ["The decade which ended with 2019 ended at zero hundred hours zero minutes zero seconds in the morning of January first 2020.", 35.0], ["Generally, when someone refers to \"the\" decade, such as the 1980s or the 1990s, the last year is the one that ends with the digit 9. Thus, the decade of the 2010s ended with 2019, and the 2020s started in 2020.", 34.0], ["The previous decade ended in 2019.", 1.0]]
what year did the decade end
history