|
|
| 1990 |
1991 |
1992 |
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
1999 |
2000 |
2001 |
2002 |
2003 |
2004 |
2005 |
2006 |
2007 |
2008 |
2009 |
2010 |
2011 |
2012 |
2013 |
2014 |
| 21.7 |
19.1 |
17.2 |
21.8 |
20 |
20.2 |
17.9 |
18.9 |
17.1 |
17.6 |
19 |
14.2 |
18 |
15.1 |
16.1 |
15.4 |
15.3 |
13.6 |
16.2 |
17.9 |
15.6 |
13.9 |
15.6 |
14.5 |
13.9 |
| 78.3 |
80.9 |
82.8 |
78.2 |
80 |
79.8 |
82.1 |
81.1 |
82.9 |
82.4 |
81 |
85.8 |
82 |
84.9 |
83.9 |
84.6 |
84.7 |
86.4 |
83.8 |
82.1 |
84.4 |
86.1 |
84.4 |
85.5 |
86.1 |
|
