http://coinchoose.com/charts.php
Mining revenue as a stat is dubious as miners chain hop to maximize revenue and coins routinely change position. The difference in profitability is merely an indicator of risk and the fact that miners are slow to react.
Try looking at value of money supply
Litecoin $56,641,732 5.21%
Namecoin $2,853,747 0.26%
PPCoin $2,592,646 0.24%
Novacoin $875,368 0.08%
Feathercoin $627,977 0.06%
Terracoin $364,711 0.03%
Devcoin $319,913 0.03%
Freicoin $218,006 0.02%
Yacoin $126,128 0.01%
Total $1,086,969,016
I only looked up the top ten because beyond that we are talking less than 0.1% per coin and it rapidly goes down to negigible valuations.
Another way of looking at it.
Litecoin $56,641,732 5.21%
Top 8 Altcoins $7,978,496 0.73%
Total $1,086,969,016