| Financial incentives | 18 % |
| Career path to paid departments | 27 % |
| Tax breaks or pensions | 24 % |
| Sense of altruism | 20 % |
| Other | 12 % |
| Total | 119 |
| Financial incentives | 18 % |
| Career path to paid departments | 27 % |
| Tax breaks or pensions | 24 % |
| Sense of altruism | 20 % |
| Other | 12 % |
| Total | 119 |