Graph
Year | Totals | Observation hours |
---|---|---|
1900 | 25 | 5:30 |
1980 | 0 | 2:00 |
1981 | 422 | 143:25 |
1982 | 212 | 100:04 |
1983 | 83 | 76:05 |
1984 | 183 | 157:55 |
1985 | 293 | 193:05 |
1986 | 197 | 180:40 |
1987 | 216 | 99:15 |
1988 | 454 | 216:00 |
1989 | 169 | 269:46 |
1990 | 244 | 262:45 |
1991 | 485 | 405:47 |
1992 | 479 | 645:00 |
1993 | 480 | 397:58 |
1994 | 227 | 286:00 |
1995 | 237 | 224:45 |
1996 | 243 | 328:00 |
1997 | 429 | 356:45 |
1998 | 322 | 339:30 |
1999 | 355 | 267:15 |
2000 | 406 | 261:30 |
2001 | 573 | 525:35 |
2002 | 382 | 526:15 |
2003 | 830 | 567:15 |
2004 | 701 | 455:05 |
2005 | 716 | 601:15 |
2006 | 438 | 389:55 |
2007 | 616 | 432:55 |
2008 | 710 | 525:55 |
2009 | 605 | 399:05 |
2010 | 343 | 249:40 |
2011 | 353 | 319:15 |
2012 | 318 | 231:35 |
2013 | 137 | 270:55 |
2014 | 145 | 291:35 |
2015 | 145 | 177:30 |
2016 | 125 | 230:15 |
2017 | 141 | 250:05 |
2018 | 221 | 318:16 |
2019 | 323 | 584:19 |
2020 | 230 | 587:17 |
2021 | 218 | 646:27 |
2022 | 229 | 477:05 |