When was Finland's 100th year of being independent?

2017 is correct because Finland declared independence from Russia on December 6, 1917; a century later, the nation marked its centenary in 2017 with the “Suomi 100” celebrations. The Finnish Parliament’s declaration came amid the chaos of the Russian Revolution, and Soviet Russia recognized Finland’s independence later that month. Context to remember: Finland had been the Grand Duchy of Finland under Russia since 1809, and before that part of Sweden. A quick memory hook: Finland’s Independence Day is 12/6/1917—add 100 years to 1917 and you get 2017. The blue-and-white national colors, seen in centenary light displays across landmarks, also echo the flag adopted after independence.