You are one of the chief people who frequent this site who needs to independently research this issue - and attempt to overcome the alarmists’ infiltration of your mind. You really have to get rid of the notion that these model-driven fears have anything to do with reality.
No matter what you have been taught by them, well over half of the Earth’s temperature change (I believe about 80% as I’ve told you before) during the 20th Century was driven by the changes of the Solar Irradiance. The modellers clearly have something wrong in the way they assess solar influence, as can clearly be seen could be the case when you realize they only have about 15% of the Sun’s radiation affecting temperature here. I don’t know exactly what is the problem but it sure is clear the MODELS are wrong.
As for the “time period over which this change is assessed”, I leave it as an exercise for the student. Try to put aside your preconceptions and revisit the DATA (not RealClimate’s reinterpretation of it) about planetary temperature changes on most of the solar bodies studied. If you can force yourself to do so - REALLY do so - you will see that the warming of those objects is clearly due to the recent, historically unusual, warmth of the Sun.
The best I can come up with (actual observational numbers) is an estimate of a solar radiation increase of 0.036 - 0.05% per decade (solar cycle max/min excluded). I'm not worrying about models or climate or clouds or cosmic rays or anything else. Now I request that you demonstrate this is sufficient to be the primary climate forcing factor on Earth and on other Solar System bodies. This seems like a pretty small change in solar output to me.