| Percent Distribution of Vesting Status of Pension Plan Active Participants in Multiemployer Plans with 100 or More Participants, 1975-1993 | ||||||||||||
| Year | All Plans | Defined Benefit Plans | Defined Contribution Plans | |||||||||
| Total | Fully Vested | Partially Vested | Not Vested | Total | Fully Vested | Partially Vested | Not Vested | Total | Fully Vested | Partially Vested | Not Vested | |
| 1975 | 100 | 34 | 1/ | 66 | 100 | 31 | 1/ | 69 | 100 | 83 | 1/ | 17 |
| 1977 | 100 | 36 | 7 | 57 | 100 | 34 | 7 | 59 | 100 | 88 | 4 | 8 |
| 1978 | 100 | 37 | 7 | 56 | 100 | 34 | 7 | 59 | 100 | 90 | 4 | 7 |
| 1979 | 100 | 38 | 7 | 55 | 100 | 35 | 7 | 59 | 100 | 90 | 4 | 7 |
| 1980 | 100 | 35 | 6 | 59 | 100 | 32 | 6 | 63 | 100 | 78 | 3 | 19 |
| 1981 | 100 | 41 | 6 | 53 | 100 | 36 | 6 | 57 | 100 | 88 | 3 | 9 |
| 1982 | 100 | 42 | 4 | 53 | 100 | 38 | 4 | 58 | 100 | 82 | 3 | 15 |
| 1983 | 100 | 47 | 4 | 48 | 100 | 42 | 5 | 54 | 100 | 86 | 3 | 11 |
| 1984 | 100 | 48 | 5 | 47 | 100 | 42 | 6 | 52 | 100 | 87 | 2 | 12 |
| 1985 | 100 | 51 | 3 | 46 | 100 | 45 | 4 | 52 | 100 | 89 | 2 | 9 |
| 1986 | 100 | 53 | 3 | 44 | 100 | 46 | 3 | 51 | 100 | 88 | 2 | 10 |
| 1987 | 100 | 53 | 4 | 43 | 100 | 45 | 3 | 52 | 100 | 86 | 6 | 9 |
| 1988 | 100 | 55 | 3 | 42 | 100 | 46 | 3 | 52 | 100 | 89 | 2 | 8 |
| 1989 | 100 | 54 | 2 | 44 | 100 | 45 | 2 | 53 | 100 | 86 | 2 | 12 |
| 1990 | 100 | 57 | 2 | 41 | 100 | 48 | 3 | 50 | 100 | 87 | 2 | 11 |
| 1991 | 100 | 57 | 3 | 40 | 100 | 47 | 3 | 50 | 100 | 88 | 2 | 11 |
| 1992 | 100 | 59 | 3 | 37 | 100 | 50 | 4 | 46 | 100 | 84 | 2 | 14 |
| 1993 | 100 | 61 | 3 | 36 | 100 | 52 | 3 | 45 | 100 | 85 | 3 | 12 |
1/The percentage of partially vested participants is not available for 1975. These participants are included in the not vested category.
NOTE: Data not available for 1976.
SOURCE: Form 5500 series reports filed with the Internal Revenue Service for 1975-1993 plan years.