i can found various statistics over the average over a whole year...like this for example...
Serie A 2003-2004
Special thanks to Fabrizio Pugi (for Stadium Postcards)
No.
Club
Average
Games
vs '03
Highest
1
AC Milan 1899
63.245
17
2,8%
78.334
2
Internazionale FC 1908
58.352
17
-5,8%
75.831
3
SS Lazio
49.341
17
11,8%
60.929
4
AS Roma
46.458
17
-18,7%
73.383
5
Juventus FC
34.365
17
-13,6%
53.883
6
UC Sampdoria
26.224
17
20,3%
35.557
7
Bologna FC 1909
23.062
17
-5,8%
33.782
8
Reggina Calcio
20.523
17
-14,9%
24.082
9
Udinese Calcio
17.642
17
4,6%
29.819
10
US Lecce 1908
16.409
17
48,4%
31.967
11
Parma AC
15.904
17
-2,5%
23.663
12
Modena FC 1912
15.480
17
8,3%
18.748
13
AC Chievo Verona 1929
14.868
17
-12,0%
34.624
14
Brescia Calcio 1911
13.807
17
-12,3%
20.878
15
Ancona Calcio
13.235
17
19,7%
23.306
16
AC Siena
11.142
17
76,8%
13.310
17
AC Perugia 1905
11.047
17
7,1%
18.796
18
Empoli FC 1920
7.340
17
-19,6%
16.186
.
Total
25.469
0,0%
78.334