| 1990
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 | 12.4
12.1 11.7 11.4 11.1 10.6 10.2 9.8 09.4 9.0 08.6 8.3 | | 24.3
24.2 24.0 23.9 23.8 23.4 23.0 22.6 22.3 21.9 21.3 20.6 | | | 55.6
55.9 56.3 56.6 56.9 57.6 58.2 58.9 59.4 60.1 61.0 62.0 | | 7.7
7.8 8.0 8.1 8.2 8.4 8.6 8.7 8.9 9.0 9.1 9.1 | | 100.0
100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 |
