Contributed by A.J. Crayon Analysis of Messier Marathons, Observer Scope Average (as of 2011) number | Averages | Year scopes in mm 1781 1 3.5 89 1977 3 7.3 186 1978 1 10.0 254 1979 6 8.2 208 1980 8 12.0 304 1981 16 8.3 211 1982 7 9.6 245 1983 12 9.0 229 1984 5 12.2 310 1985 17 10.7 272 1986 2 6.0 152 1988 7 11.3 287 1989 1 8.0 203 1990 3 11.0 280 1991 1 13.1 333 1992 1 12.5 318 1993 15 8.7 221 1994 19 8.6 218 1995 29 9.4 240 1996 35 9.7 247 1997 23 9.8 250 1998 8 8.0 203 1999 41 11.4 289 2000 33 8.9 226 2001 80 14.2 361 2002 38 9.2 234 2003 76 11.4 291 2004 36 9.8 250 2005 54 10.2 259 2006 65 8.8 225 2007 82 11.9 301 2008 59 9.8 249 2009 55 9.4 239 2010 45 9.4 238 2011 30 9.7 247 Author: A.J. Crayon http://messier.seds.org/xtra/marathon/Observer_scope_average-2011.txt