The Japanese conventional calendar system is represented by 12 symbolic zodiac animals in a cycle of 12 years. They rotate in the order of the rat, ox, tiger, rabbit, dragon, snake, horse, sheep, monkey, cock, dog, and the boar.
The year 2003 (the 15 year of Heisei) falls on the Year of the Sheep in the zodiac calendar.
They say that everyone shares their zodiac animal's character.
So people born in the Year of the Sheep (〜1919, 1931, 1943, 1955, 1967, 1979, 1991) are said to be friendly and obedient.
So let's be friendly and considerate to the environment for our earth to exist forever.