"Figure 5.1: Number of men accruing a contributing year: by type and contribution, 1978/79 to 2011/12","" "United Kingdom, millions","" "","" "Notes","1. The figures for 2010/11 and 2011/12 are provisional. They may change as further information becomes available 2. Contributing year eligibility depends on currently enacted legislation. Therefore, historic figures in previous versions of this chart may be different than presented here 3. The 'Mixed' category represents combinations of credits and classes of National Insurance contributions 4. The data comes from DWP's Lifetime Labour Market Database 1% sample of the National Insurance Recording System 5. Home Responsibilities Protection (HRP) was replaced with weekly carer credits as of April 2010 (See Credits and Home Responsibilities Protection section)" "Unit","Millions" "","" "","Class 1 only","Class 2 only","Class 3 only","Credits","Mixed","Home Responsibilities Protection" "1978/79","","13.5","1.0","0.1","1.4","0.7" "1979/80","","13.6","1.0","0.1","1.5","0.6" "1980/81","","13.2","1.1","0.1","1.8","0.7" "1981/82","","12.4","1.1","0.1","2.3","0.8" "1982/83","","12.1","1.2","0.1","2.6","0.9" "1983/84","","11.9","1.2","0.1","3.0","1.0" "1984/85","","11.7","1.3","0.1","3.2","1.0" "1985/86","","12.2","1.6","0.1","3.2","0.6" "1986/87","","12.1","1.4","0.1","3.2","0.8" "1987/88","","11.9","1.5","0.1","3.1","1.0" "1988/89","","12.1","1.6","0.1","2.9","0.9" "1989/90","","12.1","1.6","0.1","2.8","0.8" "1990/91","","12.0","1.6","0.1","2.9","0.8" "1991/92","","11.4","1.5","0.1","3.3","0.9" "1992/93","","11.0","1.5","0.1","3.6","0.9" "1993/94","","10.8","1.5","0.1","3.7","1.0" "1994/95","","10.8","1.5","0.1","3.5","1.0" "1995/96","","10.9","1.6","0.1","3.6","1.0" "1996/97","","11.0","1.6","0.1","3.5","1.0" "1997/98","","11.4","1.5","0.1","3.5","0.9" "1998/99","","11.7","1.4","0.1","3.3","0.8" "1999/00","","11.9","1.5","0.1","3.2","0.8" "2000/01","","12.1","1.5","0.1","3.2","0.8" "2001/02","","12.2","1.6","0.1","3.1","0.8" "2002/03","","12.1","1.6","0.1","3.1","0.8" "2003/04","","12.2","1.6","0.1","3.1","0.8" "2004/05","","12.3","1.6","0.1","3.0","0.8" "2005/06","","12.5","1.6","0.1","3.1","0.7" "2006/07","","12.7","1.6","0.1","3.1","0.7" "2007/08","","12.9","1.6","0.0","3.0","0.7" "2008/09","","12.7","1.5","0.0","3.1","0.7" "2009/10","","12.1","1.5","0.0","3.4","0.7" "2010/11","","12.1","1.4","0.0","2.5","0.5" "2011/12","","12.0","1.4","0.0","2.4","0.5"