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:
| No. | Air date | Network | Household\nrating | Viewers\n(millions) |
| --- | --- | --- | --- | --- |
| 18th | June 27, 1991 | CBS | 13.5 | 18.9 |
| 19th | June 23, 1992 | NBC | 15.3 | 20.2 |
| 20th | May 26, 1993 | ABC | 16.4 | 22 |
| 21st | May 25, 1994 | ABC | 14.1 | 18.9 |
| 22nd | May 19, 1995 | NBC | 10.2 | 13.7 |
| 23rd | May 22, 1996 | CBS | 11.4 | 15.1 |
| 24th | May 21, 1997 | ABC | 11.8 | 15.9 |
| 25th | May 15, 1998 | NBC | 10.2 | 13 |
| 26th | May 21, 1999 | CBS | 10.4 | 14.2 |
| 27th | May 19, 2000 | ABC | 9.1 | 13 |
| 28th | May 18, 2001 | NBC | 7.9 | 10.3 |
| 29th | May 17, 2002 | CBS | 6.9 | 10.1 |
| 30th | May 16, 2003 | ABC | 6.3 | 8.6 |
| 31st | May 21, 2004 | NBC | 6 | 8.4 |
| 32nd | May 20, 2005 | CBS | 5.5 | 7.6 |
| 33rd | April 28, 2006 | ABC | 4.5 | 6.1 |
| 34th | June 15, 2007 | CBS | 5.9 | 8.3 |
| 35th | June 20, 2008 | ABC | 4 | 5.4 |
| 36th | August 30, 2009 | CW | 2 | 2.7 |
| 37th | June 27, 2010 | CBS | 3.8 | 5.6 |
| 38th | June 19, 2011 | CBS | 3.7 | 5.5 |
| 39th | June 23, 2012 | HLN |  | 2 (5 broadcasts) |
Question:
which network had the all-time top number of viewers?
Answer:
ABC