Efficiency (electricity and heat) production from conventional thermal plants

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
#?country as ?ugeo
bif:either (?ugeo = 'DE', 'Germany', ?country) as ?ugeo
?1990
?2005
?2009
?2010
(xsd:double(?2005)-xsd:double(?2010)) as ?delta_2005_2010
(xsd:double(?1990)-xsd:double(?2010)) as ?delta_1990_2010
(xsd:double(?1990)-xsd:double(?2009)) as ?delta_1990_2009

{{
SELECT
?country
?ugeo
bif:either(?year = 1990, sum(?efficiency_rate),0) AS ?1990
bif:either(?year = 2005, sum(?efficiency_rate),0) AS ?2005
bif:either(?year = 2009, sum(?efficiency_rate),0) AS ?2009
bif:either(?year = 2010, sum(?efficiency_rate),0) AS ?2010

{{
SELECT DISTINCT
    ?country
    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
?ugeo
  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 .
    ?geo skos:prefLabel ?country .
}}  GROUP BY ?date ?ugeo ?eeageo ?memberOf ?country
    ORDER BY ?date ?ugeo
}}
}} ORDER BY ?country