Graph
Year | Totals | Observation hours |
---|---|---|
1983 | 0 | 9:15 |
1984 | 1 | 27:20 |
1985 | 13 | 29:00 |
1986 | 21 | 69:40 |
1987 | 44 | 47:00 |
1988 | 0 | 17:30 |
1989 | 16 | 45:00 |
1990 | 0 | 35:30 |
1991 | 346 | 48:28 |
1992 | 206 | 45:00 |
1993 | 287 | 51:30 |
1994 | 3 | 27:30 |
1995 | 186 | 50:00 |
1996 | 22 | 49:15 |
1997 | 407 | 34:50 |
1998 | 208 | 50:00 |
1999 | 182 | 57:20 |
2000 | 78 | 42:30 |
2001 | 201 | 69:35 |
2002 | 525 | 76:40 |
2003 | 256 | 108:30 |
2004 | 522 | 111:45 |
2005 | 194 | 145:21 |
2006 | 938 | 152:17 |
2007 | 2971 | 187:59 |
2008 | 1948 | 132:42 |
2009 | 587 | 75:32 |
2010 | 856 | 236:16 |
2011 | 2792 | 281:19 |
2012 | 3138 | 394:00 |
2013 | 3049 | 408:08 |
2014 | 2692 | 481:30 |
2015 | 2407 | 400:00 |
2016 | 2969 | 467:00 |
2017 | 4889 | 490:30 |
2018 | 3903 | 442:30 |
2019 | 2277 | 431:54 |
2020 | 3094 | 451:00 |
2021 | 2483 | 382:00 |