Year	Observations
2026	251076
2025	448911
2024	396125
2023	691040
2022	426739
2021	415937
2020	407868
2019	327265
2018	265071
2017	277359
2016	259078
2015	250184
2014	201591
2013	190859
2012	185578
2011	147872
2010	151151
2009	139009
2008	142512
2007	118853
2006	114990
2005	107228
2004	121774
2003	112511
2002	87863
2001	57283
2000	44601
1999	27248
1998	19352
1997	5785
1996	2728
1995	1482
1994	1539
1993	489