I've noticed that Donald Trump will often cite the current value of stock market indices, the current unemployment rate, the current number of people working in the US, and even the current GDP value, as indications of his performance.
I assumed that the current values of these economic metrics aren't relevant when judging a president; rather the amount that a president grows these values should be what is used. However, even news outlets that are normally critical of Trump seem to praise him for being president when these metrics have record high values. For example, he seems to draw praise when the Dow Jones index hits a record high, even though he hasn't grown the Dow by anywhere close to what many of his predecessors (including his immediate predecessor) have.
Can anyone shed light on what I'm missing here?