Efficiency of conventional thermal electricity and heat production

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
?year
sum(?EEA33) as  ?EEA33
sum(?EEA32) as  ?EEA32
sum(?EU28) as  ?EU28
sum(?EU27) as  ?EU27
sum(?EU15) as  ?EU15
sum(?NMS12) as  ?NMS12
sum(?NMS10) as  ?NMS10

{{
SELECT 
?year
bif:either(?memberOfcode = 'EEA33', ?efficiency_rate,0) AS ?EEA33
bif:either(?memberOfcode = 'EEA32', ?efficiency_rate,0) AS ?EEA32
bif:either(?memberOfcode = 'EU28', ?efficiency_rate,0) AS ?EU28
bif:either(?memberOfcode = 'EU27', ?efficiency_rate,0) AS ?EU27
bif:either(?memberOfcode = 'EU15', ?efficiency_rate,0) AS ?EU15
bif:either(?memberOfcode = 'NMS12', ?efficiency_rate,0) AS ?NMS12
bif:either(?memberOfcode = 'NMS10', ?efficiency_rate,0) AS ?NMS10

{{
SELECT DISTINCT
    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
?memberOfcode

  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 FILTER (?memberOfcode IN ('EEA33','EEA32','NMS12','NMS10','EU28','EU27','EU15')) .
}}  GROUP BY ?date ?memberOf ?memberOfcode
}} GROUP BY ?year 
}} GROUP BY ?year ORDER BY ?year