Graph
Year | Totals | Observation hours |
---|---|---|
1983 | 1082 | 9:15 |
1984 | 961 | 27:20 |
1985 | 309 | 29:00 |
1986 | 1025 | 69:40 |
1987 | 786 | 47:00 |
1988 | 241 | 17:30 |
1989 | 1154 | 45:00 |
1990 | 2316 | 35:30 |
1991 | 4124 | 48:28 |
1992 | 1671 | 45:00 |
1993 | 1855 | 51:30 |
1994 | 642 | 27:30 |
1995 | 2023 | 50:00 |
1996 | 657 | 49:15 |
1997 | 1542 | 34:50 |
1998 | 496 | 50:00 |
1999 | 1373 | 57:20 |
2000 | 1221 | 42:30 |
2001 | 2414 | 69:35 |
2002 | 3663 | 76:40 |
2003 | 4697 | 108:30 |
2004 | 3615 | 111:45 |
2005 | 4987 | 145:21 |
2006 | 7393 | 152:17 |
2007 | 10076 | 187:59 |
2008 | 3106 | 132:42 |
2009 | 3003 | 75:32 |
2010 | 7021 | 236:16 |
2011 | 6465 | 281:19 |
2012 | 13798 | 394:00 |
2013 | 19382 | 408:08 |
2014 | 20910 | 481:30 |
2015 | 8701 | 400:00 |
2016 | 10686 | 467:00 |
2017 | 7291 | 490:30 |
2018 | 19710 | 442:30 |
2019 | 12256 | 431:54 |
2020 | 14324 | 451:00 |
2021 | 19515 | 382:00 |
2022 | 30943 | 317:58 |