Occupiers of Zuccotti Park and other sites around the country have been criticized for the fuzziness of their goals. Their complaint that the privileged few in the top 1 percent are getting a disproportionate share of the nation’s prosperity, however, is spot on. And Wall Streeters are taking a bigger and bigger chunk of that income.

Who exactly are the people at the top? They are 1.4 million families that made on average $1 million in 2009, the latest data available. They took a hit from the 2008 financial crisis, but no doubt are regaining lost ground. The rich always do: a report published last week by the Congressional Budget Office shows that the share of national income going to the top percentage of households skyrocketed over the last three decades, even as it fell for the vast majority of American families.

The top 1 percent’s share of the nation’s total adjusted gross income was 17 percent in 2009, down from 23 percent two years before. But those people are still earning more than the entire bottom half of the population.

The first chart shows the share of national income that goes to families at different points of the income distribution. Since the mid-1980s the top 10 percent of Americans have increased their share at the expense of everybody else. But the lion’s share of these gains accrued to the richest 1 percent; and half of those gains went to the top 0.1 percent.