| 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 | |
| 66.68 |
29.75 |
27.6 |
9.33 |
| 68.22 |
24.77 |
33.26 |
10.19 |
| 96.74 |
43.55 |
41.7 |
11.49 |
| 111.4 |
49.05 |
50.25 |
12.1 |
| 120.66 |
50.73 |
57.28 |
12.65 |
| 134.73 |
57.46 |
64.54 |
12.73 |
| 157.81 |
66.74 |
76.86 |
14.21 |
| 201.35 |
75.26 |
107.23 |
18.86 |
| 220.38 |
78.43 |
124.91 |
17.04 |
| 246.98 |
83.94 |
145.85 |
17.19 |
| 269.43 |
93.12 |
158.81 |
17.5 |
| 257.28 |
87.63 |
153.87 |
15.78 |
| 257.29 |
75.94 |
166.87 |
14.48 |
| 285.85 |
80.91 |
190.95 |
13.99 |
| 322.4 |
87.83 |
220.68 |
13.89 |
| 398.87 |
98.05 |
288.1 |
12.72 |
| 435.15 |
108.35 |
314.95 |
11.85 |
| 483.06 |
109.8 |
360.09 |
13.17 |
| 500.98 |
98.11 |
391.65 |
11.22 |
| 529.79 |
101.2 |
417.77 |
10.82 |
| 552.35 |
106.57 |
436.34 |
9.44 |
| 582.71 |
140.01 |
433.5 |
9.2 |
| 606.73 |
148.33 |
449.51 |
8.89 |
| 651.79 |
164.48 |
479.53 |
7.78 |
| 706.85 |
180.95 |
519.2 |
6.7 |
| 718.39 |
181.03 |
531.63 |
5.73 | |
