Decade	Silver Maple					Sugar Maple
	Decade Loss %			Pop’n.	Annual	Decade Loss %			Pop’n.	Annual
	A	B	C	Left	Repl. N.	A	B	C	Left	Repl. N.
1-10	5	5	—	900	16.7	5	7	—	880	20.0
11-20	—	5	—	855	2.8	—	7	—	818	3.9
21-30	—	5	—	812	1.7	—	7	—	761	2.2
31-40	—	5	—	771	1.1	—	7	—	708	1.5
41-50	—	5	—	733	0.8	—	7	5	623	1.8
51-60	—	5	—	696	0.7	—	7	10	517	1.9
61-70	—	5	5	626	1.1	—	7	20	377	2.1
71-80	—	5	10	532	1.2	—	7	30	238	1.8
81-90	—	5	20	399	1.5	—	7	40	126	1.3
91-100	—	5	30	259	1.5		Write Off		0	1.3
101-110	—	5	40	142	1.1
111-120		Write Off		0	1.2
Annual Replacement Need/1000 Trees					31.4 trees/yr.					37.8 trees/yr.
Average Service per Tree					73.2 years					56.5 years