Graph
Year | Totals | Observation hours |
---|---|---|
1983 | 0 | 9:15 |
1984 | 24 | 27:20 |
1985 | 221 | 29:00 |
1986 | 558 | 69:40 |
1987 | 1060 | 47:00 |
1988 | 308 | 17:30 |
1989 | 467 | 45:00 |
1990 | 886 | 35:30 |
1991 | 298 | 48:28 |
1992 | 129 | 45:00 |
1993 | 1108 | 51:30 |
1994 | 0 | 27:30 |
1995 | 386 | 50:00 |
1996 | 673 | 49:15 |
1997 | 16 | 34:50 |
1998 | 64 | 50:00 |
1999 | 263 | 57:20 |
2000 | 87 | 42:30 |
2001 | 2119 | 69:35 |
2002 | 612 | 76:40 |
2003 | 918 | 108:30 |
2004 | 1452 | 111:45 |
2005 | 1186 | 145:21 |
2006 | 1596 | 152:17 |
2007 | 4807 | 187:59 |
2008 | 3521 | 132:42 |
2009 | 592 | 75:32 |
2010 | 3997 | 236:16 |
2011 | 7278 | 281:19 |
2012 | 9631 | 394:00 |
2013 | 6005 | 408:08 |
2014 | 4822 | 481:30 |
2015 | 7884 | 400:00 |
2016 | 9201 | 467:00 |
2017 | 10261 | 490:30 |
2018 | 15171 | 442:30 |
2019 | 23213 | 431:54 |
2020 | 18760 | 451:00 |
2021 | 12477 | 382:00 |