Graph
Year | Totals | Observation hours |
---|---|---|
1900 | 6 | 5:30 |
1980 | 0 | 2:00 |
1981 | 969 | 143:25 |
1982 | 567 | 100:04 |
1983 | 301 | 76:05 |
1984 | 868 | 157:55 |
1985 | 723 | 193:05 |
1986 | 629 | 180:40 |
1987 | 130 | 99:15 |
1988 | 622 | 216:00 |
1989 | 879 | 269:46 |
1990 | 1660 | 262:45 |
1991 | 2638 | 405:47 |
1992 | 1755 | 645:00 |
1993 | 2086 | 397:58 |
1994 | 992 | 286:00 |
1995 | 549 | 224:45 |
1996 | 2115 | 328:00 |
1997 | 1566 | 356:45 |
1998 | 1666 | 339:30 |
1999 | 1129 | 267:15 |
2000 | 854 | 261:30 |
2001 | 943 | 525:35 |
2002 | 1532 | 526:15 |
2003 | 1743 | 567:15 |
2004 | 1535 | 455:05 |
2005 | 1709 | 601:15 |
2006 | 1602 | 389:55 |
2007 | 1147 | 432:55 |
2008 | 1062 | 525:55 |
2009 | 1551 | 399:05 |
2010 | 942 | 249:40 |
2011 | 2012 | 319:15 |
2012 | 1556 | 231:35 |
2013 | 3597 | 270:55 |
2014 | 781 | 291:35 |
2015 | 1830 | 177:30 |
2016 | 1132 | 230:15 |
2017 | 621 | 250:05 |
2018 | 1028 | 318:16 |
2019 | 1094 | 584:19 |
2020 | 1909 | 587:17 |
2021 | 732 | 646:27 |
2022 | 588 | 479:35 |