Using proportional numbers, figures don't always line up cleanly in data columns:

Net Sales by Operating Segment
2010Change2009Change2008
Americas$24,49829%$18,98115%$16,552
Europe18,69258%11,81028%9,233
Japan3,98175%2,27932%1,728
Asia-Pacific8,256160%3,17918%2,686
Retail9,79847%6,656(9)%7,292
Total$65,22552%$42,90514%$37,491

With tabular figures, numbers display consistently within columns:

Net Sales by Operating Segment
2010Change2009Change2008
Americas$24,49829%$18,98115%$16,552
Europe18,69258%11,81028%9,233
Japan3,98175%2,27932%1,728
Asia-Pacific8,256160%3,17918%2,686
Retail9,79847%6,656(9)%7,292
Total$65,22552%$42,90514%$37,491

Font used: Minion Pro by Adobe (via Typekit).

Source: Apple, 2010 Annual Report

You can experiment directly by editing the contents of the tables!