CO2-emission intensity from electricity generation - trajectory

PREFIX skos: <http://www.w3.org/2004/02/skos/core#> 
PREFIX geo: <http://dd.eionet.europa.eu/vocabulary/eurostat/geo/>
PREFIX proxy: <http://semantic.eea.europa.eu/project/indicators/gap_filling_data/ENER038/proxy_2020_2030_2050.tsv#>

SELECT 
  year(?year) AS ?date
  bif:either(?geo = geo:DE, 'Germany', bif:either(?geo = geo:EU27_2020, 'EU-27', bif:either(?geo = geo:EU28, 'EU-27 + UK', ?ugeo))) AS ?ugeo
  SUM(?index) AS ?index
  SUM(?index_trajectory_low) AS ?index_trajectory_low
  SUM(?index_trajectory_high) AS ?index_trajectory_high
  {{

    SELECT
      ?year
      ?geo
      bif:either(year(?year) = 2020, ?proxy_index, '') AS ?index
    WHERE {
      GRAPH <http://semantic.eea.europa.eu/project/indicators/gap_filling_data/ENER038/proxy_2020_2030_2050.tsv> 
      {
        _:proxy proxy:date ?year .
        _:proxy proxy:geo ?geo .
        _:proxy proxy:obsValue ?proxy_index .
      }
    }
  } UNION {
    SELECT 
      xsd:date("2030-01-01") AS ?year
      geo:EU27_2020 AS ?geo
      118.0 AS ?index_trajectory_high
    WHERE {}
  } UNION {
    SELECT 
      xsd:date("2030-01-01") AS ?year
      geo:EU27_2020 AS ?geo
      110.0 AS ?index_trajectory_low
    WHERE {}
  } UNION {
    SELECT 
      xsd:date("2020-01-01") AS ?year
      geo:EU27_2020 AS ?geo
      265 AS ?index_trajectory_low
    WHERE {}
  } UNION {
    SELECT 
      xsd:date("2020-01-01") AS ?year
      geo:EU27_2020 AS ?geo
      265 AS ?index_trajectory_high
    WHERE {}
  }
  ?geo rdfs:label ?ugeo .
}