These go up and down based on cash management needs and portfolio allocation choices between public and private debt, and so you can pick one year when cash management needs were high or appetite for riskier were low. And then count on people being dupes, LOL.
The government is a sector of the economy. You can argue that we are borrowing too much, and I would agree, but you are not gonna fix that until you address the foreign capital inflows. That means rolling back the investor rights agreements. As long as foreign nations can print money and use it to buy dollars in order to stimulate their exports, the US is going to have a problem with excessive debt loads. The flipside of that is that the US will not have a problem of foreign investors decreasing their holdings. It will increase every single year, in line with foreign export demands. If anyone tells you the opposite, just look for the error or the lie, because I guarantee you there is one. This article has both.