Galt in Oregon

From Instapundit, an article about Oregon taxes.  They key bit:

Instead of $180 million collected last year from the new tax, the state received $130 million...One reason revenues are so low is that about one-quarter of the rich tax filers seem to have gone missing. The state expected 38,000 Oregonians to pay the higher tax, but only 28,000 did.

I know Oregon is a low-population state (about 3.8 million people).  But only 28,000 people earn more than $250,000?  That's less than seven-tenths of a percent.  Pretty astounding if the WSJ has its facts straight.

I wonder how the percentages for other states compare?