Graph

Eared Grebe
(Podiceps nigricollis)

Additional information on: Christmas Bird Count (CBC)

Listing of the threshold values that appear on the graph
Population below lowest acceptable level		Goal
2.132		3.046

Listing of the individual data points that make up the graph
Year	Annual index	Lower limit	Upper limit
1970	3.13	1.89	47.1
1971	3.72	2.26	42.7
1972	2.83	1.62	46.1
1973	2.59	1.58	37.6
1974	2.96	1.84	38.4
1975	2.87	1.85	39.9
1976	2.14	1.56	3.25
1977	2.42	1.64	8.99
1978	2.53	1.76	7.07
1979	4.33	2.26	50.6
1980	4.83	2.58	52.4
1981	2.34	1.66	6.22
1982	2.91	1.91	14.5
1983	3.5	2.49	6.8
1984	2.78	2.03	4.17
1985	3.47	1.88	36.6
1986	4.21	1.99	57.3
1987	2.19	1.3	16.2
1988	1.82	1.26	5.71
1989	2.79	1.27	36.1
1990	2.31	1.19	25.6
1991	2.44	1.49	16.9
1992	2.73	1.34	33.6
1993	2.32	1.46	12
1994	3.65	1.99	39.7
1995	3.14	1.91	15.3
1996	2.48	1.53	15.7
1997	3.26	2.02	11.7
1998	2.59	1.83	5.72
1999	2.33	1.69	3.69
2000	2.01	1.46	3.21
2001	2.76	1.62	22.8
2002	2.43	1.49	16
2003	2.13	1.53	3.29
2004	2.05	1.49	3.26
2005	2.34	1.65	5.08
2006	3.35	2.02	20.9
2007	3.26	2.06	21.6
2008	2.44	1.67	6.47
2009	2.06	1.39	5.49
2010	3.24	2.18	8.58
2011	3.28	2.23	8.32
2012	2.48	1.74	4.63
2013	2.77	1.91	6.11
2014	3.54	2.4	7.94
2015	4.36	2.28	30.4
2016	2.59	1.68	5.92

Notes on numeric data: Ex represents 10 to the power of x; For example 1.2345E-2 is equivalent to 0.012345