| | One Plan | Two Plans | Three or More Plans |
| 1996 | | | |
All Small Firms (3-199 Workers)* | 79% | 15% | 6% |
All Large Firms (200 or More Workers)* | 21 | 17 | 63 |
ALL FIRM SIZES | 33% | 16% | 51% |
| 1999 | | | |
All Small Firms (3-199 Workers) * | 76% | 16% | 8% |
All Large Firms (200 or More Workers)* | 20 | 18 | 62 |
ALL FIRM SIZES | 39% | 17% | 44% |
| 2000 | | | |
All Small Firms (3-199 Workers)* | 77% | 14% | 9% |
All Large Firms (200 or More Workers)* | 20 | 15 | 65 |
ALL FIRM SIZES | 39% | 15% | 46% |
| 2001 | | | |
All Small Firms (3-199 Workers) * | 76% | 15% | 9% |
All Large Firms (200 or More Workers)* | 23 | 16 | 61 |
ALL FIRM SIZES | 41% | 16% | 43% |
| 2002 | | | |
All Small Firms (3-199 Workers)* | 76% | 15% | 10% |
All Large Firms (200 or More Workers)* | 23 | 15 | 62 |
ALL FIRM SIZES | 40% | 15% | 45% |
| 2003 | | | |
All Small Firms (3-199 Workers)* | 62% | 17% | 21% |
All Large Firms (200 or More Workers)* | 26 | 15 | 59 |
ALL FIRM SIZES | 38% | 16% | 47% |
| 2004 | | | |
All Small Firms (3-199 Workers)* | 73% | 17% | 10% |
All Large Firms (200 or More Workers)* | 18 | 18 | 63 |
ALL FIRM SIZES | 35% | 18% | 47% |
| 2005 | | | |
All Small Firms (3-199 Workers) * | 67% | 21% | 12% |
All Large Firms (200 or More Workers)* | 22 | 19 | 59 |
ALL FIRM SIZES | 37% | 20% | 43% |