Where have all the oranges gone?

Hasn't it been quiet around here? Too quiet. It makes me nervous. So I checked with the Department of Homeland Security to confirm my suspicion that things have gotten quieter.

Changes in the Homeland Security Advisory System by Year

The orange bars show the number of alerts (upgrades to orange or red) per year. These are on the scale on the left side of the graph (0 to 5). They peak in 2003 at 4. Then they level off in 2005 and 2006 (at 1). The blue bars show the total number of days that year when the security system was on alert (orange or red). These are on the scale on the right side of the graph (0 to 120). The total days peak in 2004 with 111 days and drop off dramatically in 2005 and 2006. In 2006 there were only 3 days on alert.

What happened in 2004? I can't remember, but it must have been some great breakthrough in the war on terror.