| Year | Viewership |
|---|---|
| 1980 | 52.1 |
| 1981 | 50.1 |
| 1982 | 47.7 |
| 1983 | 48.3 |
| 1984 | 46.3 |
| 1985 | 48 |
| 1986 | 45.8 |
| 1987 | 45.4 |
| 1988 | 42.2 |
| 1989 | 41.8 |
| 1990 | 41 |
| 1991 | 41.2 |
| 1992 | 41.7 |
| 1993 | 40.7 |
| 1994 | 39 |
| 1995 | 35.7 |
| 1996 | 34.5 |
| 1997 | 34.7 |
| 1998 | 32.1 |
| 1999 | 32 |
| 2000 | 31.9 |
| 2001 | 32.9 |
| 2002 | 30.1 |
| 2003 | 29.3 |
| 2004 | 28.8 |
| 2005 | 27 |
| 2006 | 26.1 |
| 2007 | 24.7 |
| 2008 | 24.5 |
| 2009 | 23.6 |
| 2010 | 23.2 |
| 2011 | 23.7 |
| 2012 | 24.7 |
| 2013 | 24.4 |
| 2014 | 25.7 |
Source: Nielsen Media Research
Note: For month of November
