Graph

Willow Ptarmigan
(Lagopus lagopus)

Additional information on: Christmas Bird Count (CBC)

Listing of the individual data points that make up the graph
Year	Annual index	Lower limit	Upper limit
1970	23.4	2.35	519
1971	22.2	2.14	498
1972	21.8	2.15	465
1973	21.6	2.12	446
1974	21.5	2.24	437
1975	21.3	2.2	418
1976	22	2.38	420
1977	21.2	2.21	389
1978	20	1.99	370
1979	19.9	2.07	352
1980	19.5	2.07	336
1981	19	1.92	328
1982	19.1	1.96	332
1983	17.2	1.89	290
1984	17.2	1.85	278
1985	19.1	1.98	330
1986	16.6	1.84	260
1987	17.7	1.89	277
1988	16.3	1.87	251
1989	16.6	1.88	253
1990	16.4	2.02	244
1991	15.1	1.69	232
1992	16	1.86	233
1993	16	1.87	226
1994	15	1.72	225
1995	15.2	1.77	226
1996	15.6	1.8	239
1997	15.5	1.8	219
1998	15.3	1.75	232
1999	16.7	2.05	249
2000	14	1.67	198
2001	13.5	1.56	194
2002	12.6	1.41	188
2003	14.4	1.69	215
2004	13.2	1.57	186
2005	13	1.47	190
2006	13.5	1.52	192
2007	13.5	1.51	199
2008	14.3	1.61	223
2009	14.4	1.75	211
2010	14.1	1.48	228
2011	14	1.56	213
2012	13.9	1.54	215
2013	13.4	1.51	208
2014	12.4	1.28	196
2015	12.6	1.33	194
2016	12.8	1.32	207

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