Distribution of sample firms across years
| Year | Total number of firms in the sample | Total number of unrelated diversified firms in the sample |
|---|---|---|
| 1980 | 58 | 18 |
| 1981 | 63 | 17 |
| 1982 | 69 | 19 |
| 1983 | 72 | 21 |
| 1984 | 73 | 21 |
| 1985 | 77 | 23 |
| 1986 | 77 | 23 |
| 1987 | 73 | 22 |
| 1988 | 70 | 22 |
| 1989 | 67 | 22 |
| 1990 | 86 | 27 |
| 1991 | 68 | 22 |
| 1992 | 72 | 22 |
| 1993 | 78 | 27 |
| 1994 | 92 | 30 |
| 1995 | 92 | 30 |
| 1996 | 91 | 29 |
| 1997 | 92 | 28 |
| 1998 | 94 | 30 |
| 1999 | 91 | 28 |
| 2000 | 93 | 28 |
| 2001 | 51 | 17 |
| 2002 | 48 | 16 |
| 2003 | 53 | 21 |
| 2004 | 79 | 25 |
| 2005 | 93 | 28 |
| 2006 | 97 | 25 |
| 2007 | 112 | 30 |
| 2008 | 83 | 20 |
| 2009 | 93 | 21 |
| 2010 | 60 | 15 |
| Year | Total number of firms in the sample | Total number of unrelated diversified firms in the sample |
|---|---|---|
| 1980 | 58 | 18 |
| 1981 | 63 | 17 |
| 1982 | 69 | 19 |
| 1983 | 72 | 21 |
| 1984 | 73 | 21 |
| 1985 | 77 | 23 |
| 1986 | 77 | 23 |
| 1987 | 73 | 22 |
| 1988 | 70 | 22 |
| 1989 | 67 | 22 |
| 1990 | 86 | 27 |
| 1991 | 68 | 22 |
| 1992 | 72 | 22 |
| 1993 | 78 | 27 |
| 1994 | 92 | 30 |
| 1995 | 92 | 30 |
| 1996 | 91 | 29 |
| 1997 | 92 | 28 |
| 1998 | 94 | 30 |
| 1999 | 91 | 28 |
| 2000 | 93 | 28 |
| 2001 | 51 | 17 |
| 2002 | 48 | 16 |
| 2003 | 53 | 21 |
| 2004 | 79 | 25 |
| 2005 | 93 | 28 |
| 2006 | 97 | 25 |
| 2007 | 112 | 30 |
| 2008 | 83 | 20 |
| 2009 | 93 | 21 |
| 2010 | 60 | 15 |