They give the global anomaly, and one for Europe; their dataset starts in January 1979.
There's only about 10 and a few years available where you can calculate the 30-year trend.
But during that time, that trend is definitely increasing:
In 2009 the 30-year trend was 0.15°C/decade.
Now it's almost 0.25 C/decade.
The trend is increasing. A lot. In just over a decade.
The rate of global warming is increasing. That is, global warming is accelerating.