A study by researchers at the University of London and University of Munich found a correlation between a rising male unemployment rate and a reduced number of domestic violence reports. The study examined unemployment data and abuse reports in England and Wales between 2004 and 2011 to reach its findings. Authors of the study have suggested that when male unemployment is high, men are more likely to try and maintain their relationships to ensure income stability.
See "When male unemployment rises, domestic violence rates fall", Olga Khazan, The Atlantic, August 6, 2013