Graph
Year | Totals | Observation hours |
---|---|---|
1900 | 0 | 5:30 |
1980 | 0 | 2:00 |
1981 | 178 | 143:25 |
1982 | 167 | 100:04 |
1983 | 167 | 76:05 |
1984 | 141 | 157:55 |
1985 | 233 | 193:05 |
1986 | 265 | 180:40 |
1987 | 191 | 99:15 |
1988 | 503 | 216:00 |
1989 | 364 | 269:46 |
1990 | 397 | 262:45 |
1991 | 656 | 405:47 |
1992 | 792 | 645:00 |
1993 | 635 | 397:58 |
1994 | 654 | 286:00 |
1995 | 433 | 224:45 |
1996 | 588 | 328:00 |
1997 | 908 | 356:45 |
1998 | 761 | 339:30 |
1999 | 578 | 267:15 |
2000 | 457 | 261:30 |
2001 | 1318 | 525:35 |
2002 | 1319 | 526:15 |
2003 | 968 | 567:15 |
2004 | 1214 | 455:05 |
2005 | 1152 | 601:15 |
2006 | 944 | 389:55 |
2007 | 1544 | 432:55 |
2008 | 823 | 525:55 |
2009 | 1778 | 399:05 |
2010 | 1107 | 249:40 |
2011 | 1984 | 319:15 |
2012 | 978 | 231:35 |
2013 | 1029 | 270:55 |
2014 | 1712 | 291:35 |
2015 | 649 | 177:30 |
2016 | 612 | 230:15 |
2017 | 1106 | 250:05 |
2018 | 1443 | 318:16 |
2019 | 1792 | 584:19 |
2020 | 3779 | 587:17 |
2021 | 1285 | 646:27 |
2022 | 2155 | 640:14 |
2023 | 3 | 2:36 |