In Japan, it's common to say, for example, "one-thousand nine-hundred and ninety-nine"　or "sen kyu-hyaku kyujyu kyu nen". It is also acceptable to say the last two digits, e.g. "kyujyu kyu nen", if the year is in the 1900s. But the latter is sometimes confusing because we also use our traditional calender in addition to the Western or Gregorian calender. For example, this year is "Heisei nijyu-ni nen" or 22nd year of Heisei. And we had Showa era, which lasted 64 years, before Heisei. So, if you just say, for instance, "sanjyu noku nen" or the year 36, it's hard to know if you are talking about the Gregorian calender year or Japanese calender year because these two systems are equally common. So, it would be best if you could state the year in full.