Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Round | Date | Score | Opponent | Opponent's Score | Result | Venue | Attendance | Best on ground | Team |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | Saturday, 2 April 2:10pm | 14.20 (104) | Richmond | 11.17 (83) | Won by 21 points | Kardinia Park (stadium) | 20,781 | Alex Ishchenko | West Coast |
| 2 | Friday, 8 April 7:40pm | 26.19 (175) | Essendon | 11.10 (76) | Won by 99 points | WACA Ground | 24,886 | John Gastev | West Coast |
| 3 | Sunday, 17 April 2:10pm | 29.18 (192) | Brisbane Bears | 10.14 (74) | Won by 118 points | WACA Ground | 16,354 | Chris Mainwaring | West Coast |
| 4 | Saturday, 23 April 2:10pm | 8.7 (55) | Collingwood | 13.16 (94) | Lost by 87 points | Victoria Park | 26,276 | James Manson | Collingwood |
| 5 | Friday, 29 April 7:40pm | 14.16 (100) | Footscray | 14.9 (93) | Won by 7 points | WACA Ground | 17,662 | Ross Glendinning | West Coast |
| 6 | Friday, 6 May 7:40pm | 17.8 (110) | North Melbourne | 17.23 (123) | Lost by 13 points | Melbourne Cricket Ground | 10,133 | Donald McDonald | North Melbourne |
| 7 | Friday, 13 May 7:40pm | 17.10 (112) | St Kilda | 3.18 (36) | Won by 76 points | WACA Ground | 12,803 | Alex Ishchenko | West Coast |
| 8 | Sunday, 22 May 2:10pm | 9.9 (63) | Hawthorn | 17.14 (116) | Lost by 53 points | Subiaco Oval | 27,344 | Chris Wittman | Hawthorn |
| 9 | Sunday, 29 May 2:10pm | 12.15 (87) | Carlton | 15.10 (100) | Lost by 13 points | Subiaco Oval | 27,663 | Ken Hunter | Carlton |
| 10 | Sunday, 5 June 2:10pm | 10.15 (75) | Richmond | 16.20 (116) | Lost by 41 points | Melbourne Cricket Ground | 7,157 | Peter Wilson | Richmond |
| 11 | Monday, 13 June 2:10pm | 10.13 (73) | Melbourne | 13.15 (93) | Lost by 20 points | Melbourne Cricket Ground | 28,045 | Alan Johnson | Melbourne |
| 12 | Sunday, 19 June 2:10pm | 8.13 (61) | Sydney | 14.20 (104) | Lost by 43 points | Sydney Cricket Ground | 12,664 | Michael Parsons | Sydney |
| 13 | Sunday, 26 June 2:10pm | 17.19 (121) | Fitzroy | 13.9 (87) | Won by 34 points | Subiaco Oval | 15,028 | Wally Matera | West Coast |
| 14 | Saturday, 2 July 2:10pm | 13.7 (85) | Essendon | 16.16 (112) | Lost by 27 points | Windy Hill | 10,298 | Simon Madden | Essendon |
| 15 | Sunday, 10 July 2:10pm | 18.18 (126) | Geelong | 16.10 (106) | Won by 20 points | Subiaco Oval | 18,537 | Chris Mainwaring | West Coast |
| 16 | Friday, 15 July 7:40pm | 14.14 (98) | Brisbane Bears | 12.17 (89) | Won by 9 points | WACA Ground | 16,074 | Mark Withers | Brisbane Bears |
| 17 | Friday, 22 July 7:40pm | 8.16 (64) | Fitzroy | 19.20 (134) | Lost by 70 points | Melbourne Cricket Ground | 7,611 | John Ironmonger | Fitzroy |
| 18 | Sunday, 31 July 2:10pm | 18.14 (122) | Melbourne | 11.12 (78) | Won by 44 points | Subiaco Oval | 16,266 | Murray Rance | West Coast |
| 19 | Sunday, 7 August 2:10pm | 16.9 (115) | North Melbourne | 12.12 (84) | Won by 31 points | Subiaco Oval | 18,193 | Guy McKenna | West Coast |
| 20 | Saturday, 13 August 2:10pm | 14.13 (97) | St Kilda | 13.10 (88) | Won by 9 points | Moorabbin Oval | 11,074 | Laurie Keene | West Coast |
| 21 | Sunday, 21 August 7:40pm | 16.15 (111) | Collingwood | 7.9 (51) | Won by 60 points | Subiaco Oval | 36,638 | Karl Langdon | West Coast |
| 22 | Sunday, 28 August 2:10pm | 7.11 (53) | Footscray | 3.11 (29) | Won by 24 points | Western Oval | 18,456 | Chris Mainwaring | West Coast |
| EF | Saturday, 3 September 2:10pm | 10.11 (71) | Melbourne | 11.7 (73) | Lost by 2 points | Waverley Park | 43,438 | – | – |
Question:
how many rounds had more than 20,000 spectators in attendance?
Answer:
8