Graph

Purple Martin
(Progne subis)

Listing of the threshold values that appear on the graph
Population below lowest acceptable level		Goal
0.92		1.226

Listing of the individual data points that make up the graph
Year	Annual Index	Lower limit	Upper limit
1970	1.37	1	2.02
1971	1.28	0.94	1.87
1972	1.31	0.956	1.94
1973	1.17	0.877	1.65
1974	1.09	0.818	1.49
1975	1.02	0.776	1.4
1976	1.08	0.817	1.48
1977	0.988	0.752	1.4
1978	0.997	0.757	1.57
1979	0.904	0.703	1.21
1980	0.827	0.632	1.11
1981	0.837	0.652	1.14
1982	0.903	0.702	1.23
1983	0.958	0.728	1.4
1984	0.913	0.692	1.37
1985	1.02	0.757	1.58
1986	0.868	0.673	1.24
1987	0.838	0.657	1.17
1988	0.794	0.631	1.08
1989	0.748	0.597	1.01
1990	0.748	0.596	1.04
1991	0.744	0.586	1.05
1992	0.788	0.616	1.14
1993	0.666	0.531	0.938
1994	0.706	0.557	1.01
1995	0.684	0.546	0.933
1996	0.597	0.473	0.817
1997	0.659	0.527	0.903
1998	0.585	0.468	0.782
1999	0.667	0.532	0.92
2000	0.727	0.561	1.17
2001	0.581	0.465	0.76
2002	0.631	0.497	0.854
2003	0.59	0.463	0.802
2004	0.582	0.455	0.789
2005	0.516	0.398	0.694
2006	0.601	0.47	0.825
2007	0.656	0.505	0.963
2008	0.617	0.473	0.87
2009	0.672	0.507	1.07
2010	0.616	0.466	0.895
2011	0.641	0.475	0.966
2012	0.683	0.514	1.01
2013	0.609	0.447	0.87
2014	0.659	0.486	0.982
2015	0.712	0.522	1.12
2016	0.788	0.56	1.31

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