Graph

Black Tern
(Chlidonias niger)

Listing of the individual data points that make up the graph
Year	Annual Index	Lower limit	Upper limit
1971	1.51	0.606	4.06
1972	1.41	0.55	3.57
1973	1.36	0.554	3.33
1974	1.3	0.546	3.02
1975	1.27	0.554	3
1976	1.14	0.452	2.59
1977	1.08	0.403	2.37
1978	1.09	0.488	2.32
1979	1.07	0.481	2.3
1980	1.02	0.467	2.12
1981	1.08	0.565	2.56
1982	0.95	0.456	1.96
1983	0.918	0.468	1.87
1984	0.916	0.479	1.92
1985	0.886	0.486	1.89
1986	0.862	0.492	1.97
1987	0.788	0.403	1.55
1988	0.77	0.415	1.57
1989	0.795	0.473	1.92
1990	0.751	0.452	1.76
1991	0.678	0.379	1.36
1992	0.698	0.423	1.73
1993	0.637	0.366	1.31
1994	0.634	0.372	1.42
1995	0.587	0.347	1.2
1996	0.556	0.316	1.11
1997	0.553	0.332	1.17
1998	0.477	0.224	0.847
1999	0.463	0.211	0.851
2000	0.48	0.279	0.958
2001	0.469	0.272	0.982
2002	0.458	0.266	0.982
2003	0.449	0.257	1.07
2004	0.4	0.212	0.791
2005	0.392	0.204	0.806
2006	0.382	0.212	0.797
2007	0.38	0.209	0.851
2008	0.312	0.123	0.629
2009	0.316	0.144	0.681
2010	0.318	0.153	0.716
2011	0.305	0.144	0.68
2012	0.297	0.143	0.69
2013	0.265	0.104	0.589
2014	0.258	0.104	0.606
2015	0.273	0.121	0.703
2016	0.243	0.097	0.612

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