Graph
Year | Totals | Observation hours |
---|---|---|
1900 | 50 | 5:30 |
1980 | 0 | 2:00 |
1981 | 305 | 143:25 |
1982 | 0 | 100:04 |
1983 | 0 | 76:05 |
1984 | 0 | 157:55 |
1985 | 3253 | 193:05 |
1986 | 2379 | 180:40 |
1987 | 511 | 99:15 |
1988 | 608 | 216:00 |
1989 | 6362 | 269:46 |
1990 | 14410 | 262:45 |
1991 | 12466 | 405:47 |
1992 | 14518 | 645:00 |
1993 | 15734 | 397:58 |
1994 | 6223 | 286:00 |
1995 | 6270 | 224:45 |
1996 | 0 | 328:00 |
1997 | 6240 | 356:45 |
1998 | 1837 | 339:30 |
1999 | 0 | 267:15 |
2000 | 0 | 261:30 |
2001 | 18000 | 525:35 |
2002 | 1701 | 526:15 |
2003 | 0 | 567:15 |
2004 | 7500 | 455:05 |
2005 | 25931 | 601:15 |
2006 | 25808 | 389:55 |
2007 | 11754 | 432:55 |
2008 | 16592 | 525:55 |
2009 | 18748 | 399:05 |
2010 | 5265 | 249:40 |
2011 | 13987 | 319:15 |
2012 | 8363 | 231:35 |
2013 | 70513 | 270:55 |
2014 | 13642 | 291:35 |
2015 | 3840 | 177:30 |
2016 | 9838 | 230:15 |
2017 | 12514 | 250:05 |
2018 | 20075 | 318:16 |
2019 | 17687 | 584:19 |
2020 | 21034 | 587:17 |
2021 | 8707 | 646:27 |
2022 | 18966 | 640:14 |