Graph
Year | Totals | Observation hours |
---|---|---|
1900 | 22 | 5:30 |
1980 | 0 | 2:00 |
1981 | 285 | 143:25 |
1982 | 594 | 100:04 |
1983 | 172 | 76:05 |
1984 | 367 | 157:55 |
1985 | 374 | 193:05 |
1986 | 510 | 180:40 |
1987 | 338 | 99:15 |
1988 | 307 | 216:00 |
1989 | 490 | 269:46 |
1990 | 404 | 262:45 |
1991 | 1859 | 405:47 |
1992 | 899 | 645:00 |
1993 | 573 | 397:58 |
1994 | 432 | 286:00 |
1995 | 1217 | 224:45 |
1996 | 4045 | 328:00 |
1997 | 3713 | 356:45 |
1998 | 1338 | 339:30 |
1999 | 919 | 267:15 |
2000 | 830 | 261:30 |
2001 | 5172 | 525:35 |
2002 | 11517 | 526:15 |
2003 | 1651 | 567:15 |
2004 | 1119 | 455:05 |
2005 | 2418 | 601:15 |
2006 | 5079 | 389:55 |
2007 | 3405 | 432:55 |
2008 | 1459 | 525:55 |
2009 | 2296 | 399:05 |
2010 | 709 | 249:40 |
2011 | 5898 | 319:15 |
2012 | 745 | 231:35 |
2013 | 13161 | 270:55 |
2014 | 759 | 291:35 |
2015 | 1434 | 177:30 |
2016 | 2661 | 230:15 |
2017 | 1586 | 250:05 |
2018 | 1979 | 318:16 |
2019 | 1767 | 584:19 |
2020 | 3937 | 587:17 |
2021 | 569 | 646:27 |
2022 | 4950 | 483:20 |