From Governing.com.

Percentage of federal
government workers who say they witnessed a violation of ethics
standards during the past 12 months, according to a national survey by the Ethics Resource Center:

52%

Percentage of state employees who say they witnessed ethical wrongdoing during the same period:
57%

Percentage of local-government workers who say they witnessed an ethical violation:
63%

Source: Ethics Resource Center, 1/29/08