| Year |
Healthy |
Slightly |
Moderately |
Strongly |
Died |
| damaged |
| By defoliation |
| 1990 |
38.4 |
34.1 |
22.6 |
3.1 |
1.8 |
| 1995 |
33.0 |
39.7 |
21.5 |
2.9 |
2.9 |
| 1996 |
35.8 |
39.2 |
19.4 |
2.9 |
2.8 |
| 1997 |
38.0 |
37.9 |
18.6 |
2.9 |
2.6 |
| 1998 |
38.1 |
39.5 |
17.6 |
2.6 |
2.2 |
| 1999 |
41.3 |
40.5 |
13.8 |
2.2 |
2.2 |
| 2000 |
51.8 |
27.5 |
12.5 |
5.9 |
2.3 |
| 2001 |
30.5 |
49.1 |
11.5 |
6.6 |
2.4 |
| 2002 |
31.7 |
46.1 |
13.2 |
4.3 |
4.7 |
| 2003 |
28.7 |
48.8 |
14.8 |
4.3 |
3.4 |
| 2004 |
29.2 |
47.1 |
13.1 |
6.1 |
4.5 |
| 2005 |
31.0 |
46.5 |
12.0 |
5.9 |
4.5 |
| 2006 |
43.2 |
39.1 |
8.7 |
6.0 |
3.1 |
| 2007 |
51.8 |
27.5 |
12.5 |
5.9 |
2.3 |
| 2008 |
60.7 |
23.2 |
10.8 |
2.5 |
2.8 |
| 2009 |
54.8 |
26.8 |
12.4 |
3.3 |
2.6 |
| 2010 |
49.3 |
28.9 |
14.7 |
4.4 |
2.7 |
| 2011 |
61.6 |
19.5 |
13.4 |
2.3 |
3.2 |
| 2012 |
59.5 |
18.4 |
15.4 |
2.5 |
4.1 |
| 2013 |
55.6 |
22.0 |
16.5 |
3.0 |
2.8 |
| 2014 |
52.3 |
23.5 |
18.2 |
3.0 |
3.0 |
| 2015 |
50.5 |
25.5 |
16.2 |
5.3 |
2.6 |
| 2016 |
33.8 |
31.6 |
26.3 |
5.8 |
2.5 |
| 2017 |
29.9 |
29.1 |
30.9 |
8.0 |
2.1 |
| 2018 |
26.5 |
26.2 |
36.5 |
8.8 |
2.0 |
| 2019 |
31.6 |
33.3 |
26.3 |
7.1 |
1.7 |
| 2020 |
27.3 |
36.0 |
29.2 |
5.3 |
2.2 |
| 2021 |
22.9 |
29.6 |
37.0 |
8.8 |
1.7 |
| 2022 |
10.9 |
22.7 |
45.5 |
19.0 |
2.0 |
| 2023 |
21.2 |
32.4 |
32.8 |
10.3 |
3.3 |
| By discoloration of the foliage |
| 1990 |
59.3 |
25.9 |
12.1 |
0.9 |
1.8 |
| 1995 |
85.1 |
10.3 |
1.6 |
0.1 |
2.9 |
| 1996 |
89.8 |
6.4 |
1.0 |
0.1 |
2.8 |
| 1997 |
92.2 |
4.3 |
0.8 |
0.1 |
2.6 |
| 1998 |
92.1 |
4.8 |
0.8 |
0.1 |
2.2 |
| 1999 |
93.2 |
3.7 |
0.8 |
0.1 |
2.2 |
| 2000 |
91.4 |
5.3 |
0.8 |
0.1 |
2.4 |
| 2001 |
93.7 |
3.4 |
0.5 |
– |
2.4 |
| 2002 |
91.6 |
5.4 |
0.5 |
– |
2.5 |
| 2003 |
91.0 |
5.8 |
0.6 |
– |
2.6 |
| 2004 |
93.7 |
3.2 |
0.3 |
– |
2.8 |
| 2005 |
92.8 |
3.6 |
0.5 |
– |
3.1 |
| 2006 |
92.9 |
3.5 |
0.6 |
0.1 |
2.9 |
| 2007 |
94.0 |
2.0 |
1.1 |
0.6 |
2.3 |
| 2008 |
96.0 |
0.4 |
0.7 |
0.2 |
2.8 |
| 2009 |
95.7 |
1.3 |
0.4 |
0.0 |
2.6 |
| 2010 |
94.8 |
2.0 |
0.4 |
0.1 |
2.7 |
| 2011 |
94.7 |
1.4 |
0.7 |
0.3 |
2.9 |
| 2012 |
95.2 |
0.8 |
0.7 |
0.2 |
3.1 |
| 2013 |
94.5 |
1.9 |
0.5 |
0.3 |
2.8 |
| 2014 |
95.3 |
1.2 |
0.4 |
0.1 |
3.0 |
| 2015 |
88.8 |
7.7 |
1.0 |
0.1 |
2.6 |
| 2016 |
90.7 |
6.3 |
0.5 |
– |
2.5 |
| 2017 |
88.0 |
7.4 |
2.7 |
0.1 |
1.8 |
| 2018 |
85.8 |
9.9 |
2.0 |
0.3 |
2.0 |
| 2019 |
89.4 |
7.9 |
– |
1.0 |
1.7 |
| 2020 |
91.9 |
5.3 |
0.6 |
– |
2.2 |
| 2021 |
94.3 |
3.8 |
0.0 |
0.2 |
1.7 |
| 2022 |
92.2 |
5.1 |
0.7 |
0.0 |
2.0 |
| 2023 |
89.1 |
6.3 |
1.1 |
0.2 |
3.3 |
Source: National Land Centre Forestry Department, Forest Protection Measuring and Monitoring System (From 1 June 2024 Ministry of Agriculture).
.
