Historical unknown co2eq values for Sweden

[VIKTORVAV99]

Added historical co2eq unknown values for Sweden back to 2015.
Since I had previously removed coal from the latest value because the last coal plant closed it resulted in a marginal increase in the co2eq value from 280.2 to 280.3 as well.

[VIKTORVAV99]

You guys might also want to re-run the generation you did for #3871 after merging this for more accurate values.

[VIKTORVAV99]

Originally when I made these calculations for #2407 I used 230 gCO2eq for renewable waste and 650 gCO2eq/kWh for non-renewable waste under the assumption it is most likely plastic and therefor oil based.

But when looking through the ENTSOE parser I noticed that waste (I assume it is all waste) is combined with biomass.

Now this makes a big difference in the combined gCO2eq/kWh value and to be consistent with other ENTSOE data the renewable and non-renewable waste should probably be combined. (even if I think the original method is more accurate)

Here is a table showing the difference for each year:

Year	Unknown gCO2eq/kWh with split waste	Unknown gCO2eq/kWh with combined waste	% difference
2015	317,1	281	13%
2016	321,6	277,9	16%
2017	315,4	270,6	17%
2018	316,8	275,5	15%
2019	299,5	258,4	16%
2020	280,3	236	19%

So should I update the values to be more consistent with the ENTSOE values or keep the old method?

Note: This might be of bigger concern when Sweden is split into bidding zones and we switch to the ENTSOE parser.

[pierresegonne]

Super!
I think that if it's possible, we'll go with the more accurate version, and we can come back to this issue when we split up Sweden to use ENTSO-E data consistently.

[VIKTORVAV99]

@pierresegonne sounds like a plan!
Also when switching to the ENTSOE parser and split bidding zones we will get gas and solar reported separately so they can be directly removed from these calculations and then it should just be biomass, peat and oil left to calculate.