I found a Federal Reserve article that analyzed the change in Average Hourly Earnings for production and nonsupervisory workers. After adjusting for inflation using the Personal consumption expenditures (PCE) {instead of the Consumer Price Index-Urban Wage Earners and Clerical Workers (CPI-W)} and including an estimate for worker's benefits, the author concluded that workers' hourly earnings (wages plus benefits) actually increased by 16% over 30 years (1975-2005) rather than decreased. Here, I graphed the full history, 1964-2006, but used the approach laid out in the article to show the effect of inflation and benefits. BTW, if you earned $16.76 an hour in 2006 that gave you an annual income of $33,520 (assuming you worked full-time).

See also:Average Income in the United StatesTotal Income of Top, Middle, & Bottom

Addendum: This was passed on to me from a reader who found it on Marginal Revolution