1 in 3 Americans Failed to Return Census Forms:
As of early Friday, the mail participation rate was 68 percent. The mail participation rate, which the bureau is using this year for the first time, is the percentage of forms mailed back by households that received them. Ref. Source 9
I did not know that US Census workers had so much authority as to demand entrance into your home if they feel you are avoiding questions:
International Level: International Guru / Political Participation: 3231 100%