Year
|
Lower than 10 000 µg/m³.h
|
Lower than 10 000 (µg/m³)•h
|
10 000-20 000 (µg/m³)•h
|
20 000-30 000 (µg/m³)•h
|
30 000-50 000 (µg/m³)•h
|
Greater than 50 000 µg/m³.h
|
Greater than 50 000 (µg/m³)•h
|
1996
|
|
|
|
|
|
|
|
1997
|
|
|
|
|
|
|
|
1998
|
|
|
|
|
|
|
|
1999
|
|
|
|
|
|
|
|
2000
|
|
|
|
|
|
|
|
2001
|
|
|
|
|
|
|
|
2002
|
|
|
|
|
|
|
|
2003
|
|
|
|
|
|
|
|
2004
|
|
2.03
|
49.34
|
20.13
|
21.31
|
|
7.19
|
2005
|
|
24.69
|
18.01
|
18.92
|
28.73
|
|
9.65
|
2006
|
|
0.2
|
31.75
|
17.99
|
39.81
|
|
10.24
|
2007
|
|
40.32
|
14.65
|
13.59
|
24.53
|
|
6.92
|
2008
|
|
21.74
|
31.23
|
21.48
|
25.06
|
|
0.5
|
2009
|
|
34.71
|
19.33
|
18.39
|
24.22
|
|
3.35
|
2010
|
|
38.9
|
15.08
|
25.06
|
18.99
|
|
1.97
|
2011
|
|
32.92
|
16.33
|
25.82
|
21.94
|
|
2.98
|
2012
|
|
36.68
|
18.68
|
18.18
|
22.87
|
|
3.59
|