Y \ X
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
15500
15499
15498
15497
15496
15495
15494
15493
15492
15491
15490
15489
15488
15487
15486
15485
15484
15483
15482
15481
15480