1975:
1976:
1977:
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1978:
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1979:
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1980:
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1981:
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1982:
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1983:
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1984:
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1985:
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1986:
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1987:
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1988:
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1989:
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1990:
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1991:
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1992:
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1993:
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1994:
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1995:
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1996:
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1997:
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1998:
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1999:
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2000:
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2001:
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2002:
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2003:
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2004:
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2005:
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2006:
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2007:
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2008:
IncreĆble forma de captar el paso del tiempo.