3 ms·
Here is a chart of that percentage over time: http://research.stlouisfed.org/fred2/series/FYOIGDA188S http://research.stlouisfed.org/fred2/series/FYOIGDA188S
by muzz 12y ago
Here is a chart of that percentage over time:
http://research.stlouisfed.org/fred2/series/FYOIGDA188S http://research.stlouisfed.org/fred2/series/FYOIGDA188S