This chart shows the evolution, as a percentage of the total number of pension plan members, of the prevalence of defined-contribution plan members from 1991 to 2006 by industry. The industries presented are the private sector and the public sector. The prevalence of defined-contribution plans changed very little in the public sector, going from 3.2% to 4.9%. The small increase was gradual and ended with a one percentage point drop in 2006. The main source of growth in the prevalence of defined contribution-plans is in the private sector. Representing 14.3% of private-sector pension plan members in 1991, the number of defined-contribution plan members increased steadily over the entire period and reached 27.4% of private-sector pension plan members in 2006.