| 1978 |
| 1979 |
| 1980 |
| 1981 |
| 1982 |
| 1983 |
| 1984 |
| 1985 |
| 1986 |
| 1987 |
| 1988 |
| 1989 |
| 1990 |
| 1991 |
| 1992 |
| 1993 |
| 1994 |
| 1995 |
| 1996 |
| 1997 |
| 1998 |
| 1999 |
| 2000 |
| 2001 |
| 2002 |
| 2003 | |
| 165 |
|
157 |
93 |
59.1 |
|
| 195 |
115.2 |
175 |
100 |
57.1 |
|
| 219 |
103.3 |
192 |
109 |
56.8 |
16.07 |
| 286 |
129 |
267 |
147 |
55.2 |
14.02 |
| 346 |
120.4 |
302 |
170 |
56.3 |
16.57 |
| 359 |
102.3 |
326 |
183 |
56.2 |
19.32 |
| 446 |
123.5 |
369 |
202 |
54.6 |
20.45 |
| 549 |
112.5 |
474 |
247 |
52.1 |
22.08 |
| 609 |
105 |
561 |
282 |
50.3 |
23.02 |
| 725 |
113.6 |
659 |
320 |
48.6 |
24.73 |
| 902 |
108.1 |
839 |
389 |
46.4 |
25.98 |
| 1011 |
97.4 |
927 |
445 |
48 |
27.09 |
| 1099 |
102.7 |
946 |
436 |
46.1 |
29.26 |
| 1211 |
108.9 |
1027 |
518 |
50.5 |
30.77 |
| 1359 |
108.8 |
1112 |
548 |
49.2 |
31.34 |
| 1746 |
110.2 |
1263 |
633 |
50.2 |
32.62 |
| 2225 |
104.1 |
1680 |
800 |
47.6 |
32.77 |
| 2966 |
105.3 |
2378 |
1198 |
50.4 |
34.14 |
| 3463 |
106.1 |
2702 |
1367 |
50.6 |
35.78 |
| 3684 |
103.8 |
2839 |
1378 |
48.5 |
37.3 |
| 3815 |
104.7 |
2891 |
1362 |
47.1 |
38.53 |
| 3948 |
105.6 |
2806 |
1293 |
46.1 |
40.27 |
| 4254 |
107.8 |
3231 |
1406 |
43.5 |
46.42 |
| 4582 |
106.9 |
3479 |
1449 |
41.6 |
47.82 |
| 4940 |
108.4 |
3693 |
1508 |
40.8 |
49.53 |
| 5431 |
107.8 |
4287 |
1637 |
38.2 |
50.73 | |
