1953	1970	1980	1990	2000
1959	1971	1981	1991	2001
	1972	1982	1992	2002
	1973	1983	1993	2003
	1974	1984	1994	2004
	1975	1985	1995	2006
	1976	1986	1996
	1977	1987	1997
	1978	1988	1998
	1979	1989	1999

Ambiguity