US Per Capita Disposable Income, from 1960:
Data from www.bea.gov, quarters seasonally adjusted at annual rates.
Per capita disposable income is calculated by adding up all sources of income including wages, salaries, benefits such as health insurance, disability, and pensions, dividends and interest for the whole US (this is Income) and subtracting current taxes (leaving Disposable Income) and dividing by the US population to give Per Capita Disposable Income in USD. This value is computed monthly or quarterly and annualized. Finally, it is converted to gold grams using the period-end London PM gold fix.
For comparison, here is a log chart showing both the USD and Gold gram versions:
And here is a closeup look at recent income data: