Context: In 2006, Household income in the United States was $43,318 per household ($26,000 per household member) with 42% of households having two income earners. Meanwhile, the median income of the average American age 25+ was roughly $32,000 ($39,000 if only counting those employed full-time between the ages of 25 to 64) in 2005. According to the CIA the Gini coefficient which measures income inequality (the higher the less equal the income distribution) was clocked at 45.0 in 2005, compared to 32.0 in the European Union and 28.3 in Germany.

Question: How many percent of households in the United States in 2006 on have one income earner?

Answer:
58