Efficiency (electricity and heat) production from conventional thermal plants - country groups

PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX sdmx-measure: <http://purl.org/linked-data/sdmx/2009/measure#> 
PREFIX sdmx-dimension: <http://purl.org/linked-data/sdmx/2009/dimension#> 
PREFIX property: <http://rdfdata.eionet.europa.eu/eurostat/property#> 
PREFIX i_ng: <http://rdfdata.eionet.europa.eu/eurostat/dic/indic_nrg#>
PREFIX unit: <http://rdfdata.eionet.europa.eu/eurostat/dic/unit#>
PREFIX geo: <http://rdfdata.eionet.europa.eu/eurostat/dic/geo#>


SELECT
?memberOfcode as ?ugeo
?1990
?2005
?2011
(xsd:double(?2011)-xsd:double(?2005)) as ?delta_2005_2011
(xsd:double(?2011)-xsd:double(?1990)) as ?delta_1990_2011
 {{
 SELECT
 ?memberOfcode
 bif:either(?year = 1990, sum(?efficiency_rate),0) AS ?1990
 bif:either(?year = 2005, sum(?efficiency_rate),0) AS ?2005
 bif:either(?year = 2010, sum(?efficiency_rate),0) AS ?2010
 bif:either(?year = 2011, sum(?efficiency_rate),0) AS ?2011
  {{
  SELECT DISTINCT
    ?memberOfcode
    year(?date) as ?year
    (round((((sum(?nrg_105a)+sum(?nrg_106a)+sum(?nrg_100a_B_101109)))/
    ((sum(?nrg_100a_B_101001))+sum(?nrg_100a_B_101009)))*1000))/10.0 as ?efficiency_rate

    WHERE {{
      GRAPH <http://rdfdata.eionet.europa.eu/eurostat/data/nrg_105a.rdf.gz> { 
      {
      _:nrg_105a sdmx-dimension:timePeriod ?date .
      _:nrg_105a property:indic_nrg i_ng:B_101101 . 
      _:nrg_105a property:geo ?geo . 
      _:nrg_105a property:unit unit:1000TOE . 
      OPTIONAL { _:nrg_105a sdmx-measure:obsValue ?nrg_105a . }
      } UNION {
      GRAPH <http://rdfdata.eionet.europa.eu/eurostat/data/nrg_106a.rdf.gz> { 
      {    
      _:nrg_106a sdmx-dimension:timePeriod ?date .
      _:nrg_106a property:indic_nrg i_ng:B_101101 . 
      _:nrg_106a property:geo ?geo . 
      _:nrg_106a property:unit unit:1000TOE . 
      OPTIONAL { _:nrg_106a sdmx-measure:obsValue ?nrg_106a . }
      }}
      } UNION {
      GRAPH <http://rdfdata.eionet.europa.eu/eurostat/data/nrg_100a.rdf.gz> { 
      {    
      _:nrg_100a sdmx-dimension:timePeriod ?date .
      _:nrg_100a property:geo ?geo  . 
      _:nrg_100a property:unit unit:1000TOE . 
      {
      _:nrg_100a property:indic_nrg i_ng:B_101109 . 
      OPTIONAL { _:nrg_100a sdmx-measure:obsValue ?nrg_100a_B_101109 . }
      } UNION {
      _:nrg_100a property:indic_nrg i_ng:B_101001 . 
      OPTIONAL { _:nrg_100a sdmx-measure:obsValue ?nrg_100a_B_101001 . }
      } UNION {
      _:nrg_100a property:indic_nrg i_ng:B_101009 . 
      OPTIONAL { _:nrg_100a sdmx-measure:obsValue ?nrg_100a_B_101009 . }
      }
    }} 
   }} ?geo skos:notation ?ugeo .
    ?eeageo owl:sameAs ?geo .
    ?eeageo skos:inScheme <http://rdfdata.eionet.europa.eu/eea/countries/> .
    ?memberOf skos:member ?eeageo .
    ?memberOf skos:notation ?memberOfcode .

  }}  GROUP BY ?date ?memberOfcode 
 }}
}}