The
Evolution
of Greg
1971
1972
1973
1974
1975
19
76
1977
1978
1979
1980
19
81
19
82
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
19
94
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012