Measurement	Region	Annual Average, 1989-1991	Annual Average, 2014-2016	Percent Change	Number of Sites	Statistical Significance
Dry inorganic nitrogen deposition (kg-N/ha)	Mid-Atlantic	2.5	0.9	-64	12	***
	Midwest	2.4	1.1	-54	9	***
	Northeast	1.3	0.4	-69	4
	Southeast	1.7	0.7	-59	8	***
Dry sulfur deposition (kg-S/ha)	Mid-Atlantic	7.0	0.9	-87	12	***
	Midwest	6.6	1.1	-83	9	***
	Northeast	2.6	0.4	-85	4
	Southeast	3.1	0.5	-84	8	***
Total inorganic nitrogen deposition (kg-N/ha)	Mid-Atlantic	8.8	5.0	-43	12	***
	Midwest	8.6	6.1	-29	9	***
	Northeast	6.7	3.7	-45	4
	Southeast	6.4	4.0	-38	8	***
Total sulfur deposition (kg-S/ha)	Mid-Atlantic	16.0	3.0	-81	12	***
	Midwest	15.0	4.0	-73	9	***
	Northeast	9.8	2.0	-80	4
	Southeast	10.3	2.6	-75	8	***
Wet nitrogen deposition from inorganic nitrogen (kg-N/ha)	Mid-Atlantic	6.2	3.9	-37	11	***
	Midwest	6.0	5.1	-15	22	***
	Northeast	5.7	3.9	-32	16	***
	Southeast	4.3	3.4	-21	22	***
Wet sulfur deposition from sulfate (kg-S/ha)	Mid-Atlantic	9.2	2.7	-71	11	***
	Midwest	7.7	2.9	-62	22	***
	Northeast	7.5	2.3	-69	16	***
	Southeast	5.9	2.2	-63	22	***