Graph

Common Raven
(Corvus corax)

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	96	66.7	158
1971	97	67	160
1972	98.7	68.5	164
1973	99.5	68.5	166
1974	102	70.5	172
1975	103	70.8	175
1976	104	71.6	177
1977	106	72.7	183
1978	108	73.6	185
1979	110	74.5	192
1980	113	76.6	197
1981	116	78.8	203
1982	118	79.5	209
1983	120	81.2	215
1984	123	82.7	222
1985	126	84.2	229
1986	130	86.2	234
1987	131	87.7	240
1988	135	89.6	247
1989	138	90.9	256
1990	141	92.9	261
1991	146	95.4	275
1992	150	97.2	290
1993	152	98.4	292
1994	157	101	305
1995	160	102	309
1996	164	105	322
1997	169	108	336
1998	173	109	347
1999	178	112	359
2000	184	115	374
2001	187	116	385
2002	194	119	401
2003	198	122	419
2004	205	125	430
2005	211	128	454
2006	217	130	471
2007	226	134	495
2008	236	140	525
2009	240	141	533
2010	250	147	560
2011	260	151	589
2012	262	151	590
2013	271	155	616
2014	275	157	635
2015	291	164	695
2016	298	168	701

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