Graph
Year | Totals | Observation hours |
---|---|---|
1971 | 2 | 1:15 |
1972 | 0 | 0:30 |
1974 | 32 | 6:30 |
1977 | 11 | 2:30 |
1982 | 0 | 1:50 |
1983 | 87 | 13:30 |
1984 | 45 | 12:30 |
1985 | 62 | 20:15 |
1986 | 20 | 2:00 |
1987 | 50 | 3:30 |
1988 | 1 | 3:15 |
1989 | 3 | 9:30 |
1990 | 0 | 0:00 |
1991 | 10 | 4:30 |
1992 | 3 | 3:00 |
1993 | 1 | 6:46 |
1994 | 0 | 1:00 |
1995 | 25 | 9:45 |
1996 | 21 | 5:15 |
1997 | 65 | 6:15 |
1998 | 15 | 6:30 |
1999 | 65 | 4:15 |
2000 | 90 | 8:45 |
2001 | 65 | 24:00 |
2002 | 225 | 11:30 |
2003 | 17 | 6:14 |
2004 | 558 | 52:15 |
2005 | 10783 | 370:45 |
2006 | 14361 | 560:00 |
2007 | 14999 | 568:00 |
2008 | 1320 | 623:30 |
2009 | 1507 | 346:10 |
2010 | 8252 | 257:51 |
2011 | 32078 | 379:30 |
2012 | 5305 | 474:30 |
2013 | 9671 | 449:30 |
2014 | 15021 | 366:57 |
2015 | 2158 | 241:57 |
2016 | 12898 | 386:02 |
2017 | 3801 | 309:56 |
2018 | 141033 | 319:16 |
2019 | 870 | 243:15 |
2020 | 20666 | 304:06 |
2021 | 13558 | 186:53 |
2022 | 16270 | 219:44 |