This is the 102nd most frequent Ukrainian word.
році
"Році" means "year" in the prepositional case in Ukrainian.
The word "році" is used in locative case to denote a specific year (1991).
У 1991 році Україна здобула незалежність.
In 1991, Ukraine gained independence.
Here, "році" indicates the current year in locative case.
У цьому році ми плануємо поїздку до Карпат.
This year, we are planning a trip to the Carpathians.
In this question, "році" is asking about a specific year in locative case.