| 2004 | IE 6 | IE 5 | O 7 | Moz | NN 3 | NN 4 | NN 7 |
| May | 72.6% | 9.7% | 2.1% | 10.7% | 0.3% | 0.3% | 1.4% |
| April | 72.4% | 10.1% | 2.1% | 10.3% | 0.3% | 0.3% | 1.4% |
| March | 72.1% | 10.7% | 2.1% | 9.6% | 0.4% | 0.4% | 1.4% |
| February | 71.5% | 11.5% | 2.2% | 9.0% | 0.4% | 0.4% | 1.5% |
| January | 71.3% | 12.8% | 2.1% | 8.2% | 0.4% | 0.5% | 1.5% |
| 2003 | IE 6 | IE 5 | O 7 | Moz | NN 3 | NN 4 | NN 7 |
| November | 71.2% | 13.7% | 1.9% | 7.2% | 0.5% | 0.5% | 1.6% |
| September | 69.7% | 16.9% | 1.8% | 6.2% | 0.6% | 0.6% | 1.5% |
| July | 66.9% | 20.3% | 1.7% | 5.7% | 0.6% | 0.6% | 1.5% |
| May | 65.0% | 22.7% | 1.4% | 4.6% | 1.0% | 0.9% | 1.4% |
| March | 63.4% | 24.6% | 1.2% | 4.2% | 0.9% | 1.1% | 1.4% |
| January | 55.3% | 29.3% | 4.0% | 1.2% | 1.7% | 1.1% | |
| 2002 | IE 6 | IE 5 | IE 4 | AOL | NN 3 | NN 4 | NN 5+ |
| November | 53.5% | 29.9% | 5.2% | 1.1% | 2.0% | 4.9% | |
| September | 49.1% | 34.4% | 4.5% | 1.3% | 2.2% | 4.5% | |
| July | 44.4% | 40.1% | 0.5% | 3.5% | 1.2% | 2.6% | 3.5% |
| May | 40.7% | 46.0% | 0.7% | 2.8% | 1.2% | 3.4% | 2.7% |
| March | 36.7% | 49.4% | 0.7% | 3.0% | 1.2% | 4.1% | 2.4% |
| January | 30.1% | 55.7% | 1.0% | 2.8% | 1.3% | 4.4% | 2.2% |
| IE | Internet Explorer |
| AOL | America Online * |
| Moz | Mozilla |
| O | Opera |
| NN | Netscape |
End stats on your list: Opera use more than doubled. Mozilla use more than tripled. Total IE use declined. People are realizing IE sucks and are finding better alternatives. Microsoft doesn't like that, especially with Opera's threatening position on the handheld market.
And that's just considering your study, which looks suspicious. A real study of browser usage should have results adding up to over 100% since many people use multiple browsers. For example, I use IE at work and Mozilla at home, and sometimes IE at home for testing web sites (to make sure my code isn't too complex for its broken rendering). I consider Mozilla to be my main broswer, but anything I do from work would also count for IE.