| 1986 |
| 1987 |
| 1988 |
| 1989 |
| 1990 |
| 1991 |
| 1992 |
| 1993 |
| 1994 |
| 1995 |
| 1996 |
| 1997 |
| 1998 |
| 1999 |
| 2000 |
| 2001 |
| 2002 |
| 2003 |
| 2004 | |
| 106.2 |
106.3 |
106.1 |
106 |
| 115.5 |
117.9 |
112.9 |
116.1 |
| 140.4 |
145.5 |
135.2 |
141.7 |
| 165.9 |
169.9 |
161.8 |
166.9 |
| 169.4 |
173.5 |
165 |
169.6 |
| 175.4 |
183.2 |
167.5 |
174.7 |
| 188.5 |
200 |
175.5 |
186.2 |
| 225.8 |
242.9 |
206 |
217.3 |
| 281.8 |
302.8 |
257.3 |
264.5 |
| 328.6 |
354.3 |
299.5 |
300.2 |
| 354.6 |
389.1 |
320.5 |
317.6 |
| 364.5 |
405 |
327.2 |
318.6 |
| 363.4 |
407 |
324.9 |
313.5 |
| 359.1 |
405 |
320.1 |
306.3 |
| 362.6 |
408.6 |
323.6 |
303.2 |
| 361.9 |
407 |
323.6 |
297.4 |
| 358.6 |
402.1 |
321.3 |
293.5 |
| 365.4 |
404.1 |
330.6 |
292.3 |
| 379.7 |
415.4 |
345.8 |
300.2 | |
