This is not an honest question.
There are how many worldwide temperature indices?
There are also measures of ocean heat content.
If all of these (air, land, and water), show no heating for 20 years, I would say it is very significant and needs to be explained and if external sources (like diminished solar activity or volcanoes) do not explain it then something significant probably has occurred.
This is not even remotely the case.
Even your cherry picked start date on your cherry picked temperature record shows a slight amount of warming.
The other temperature records show even more warming.
And then we get to the place where 90% of the heat goes, the ocean. This has shown zero signs of slowing down although the upper layer has been transferring a large amount of heat to the lower level.
So you are genuinely interested in learning?
You have six years on this thread of being anything but interested in learning a thing.
If you just want to focus on atmospheric temperatures, why wouldn't you average NASA/GISS, HAD (3 or 4 or whatever), NOAA, UAH, and RSS?
Why would you pick just one?
And then why do all your starting points include 1998?
As if you will ever honestly answer these questions.