It is 1989.
M = 1000
CM = 900 (C=100, placed before the M means subtract it)
L = 50
X = 10 (three together means 30)
IX = 9 (I = 1, placed before 10 means subtract it)
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MCMLXXXIX is 1989.
In todays modern notation of Roman numerals MCMLXXXIX represents 1989 But the ancient Romans would have worked it out and wrote it out quite differently than the way we do today.
Arabic number for: M=1000 CM=900 L=50 XXX=30 IX=9 Therefore: MCMLXXXIX= 1989
1989
MCMLXXXIX