In NZ, the Household Incomes Survey tells us that in 1982, 52% of two parent families had one parent in full-time work and the other was workless. Only 20% were both in full-time work. By 2011, 68% of two parent families were dual-earner families with 43% both full-time.
(Theses statistics are contributing heavily to growing household income inequality by the way).
Modern Views on Mothers as BreadwinnersJune 21, 2013
A record 40 percent of all households with children under the age of 18 include mothers who are either the sole or primary source of income for the family, according to a new Pew Research Center analysis of data from the U.S. Census Bureau. The share was just 11 percent in 1960.More