Packaging waste generation per capita and by country

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 u: <http://rdfdata.eionet.europa.eu/eurostat/dic/unit#>
PREFIX g: <http://rdfdata.eionet.europa.eu/eurostat/dic/geo#> 
PREFIX a: <http://rdfdata.eionet.europa.eu/eurostat/dic/age#>
PREFIX s: <http://rdfdata.eionet.europa.eu/eurostat/dic/sex#>
PREFIX wst: <http://rdfdata.eionet.europa.eu/eurostat/dic/wst_oper#>
PREFIX flow: <http://rdfdata.eionet.europa.eu/eurostat/dic/flow#>
PREFIX waste: <http://rdfdata.eionet.europa.eu/eurostat/dic/waste#>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>

SELECT
    ?date
    (round(sum(?waste)*10000/sum(?population)))/10.0 as ?kg_pro_capita
    #((round(sum(?waste)*100/sum(?population))*10000)) as ?kg_pro_capita
    sum(?population) as ?population 
    (sum(?waste)) as ?waste
    ?ugeo
  {{
  SELECT
    ?date
    ?population 
    ?waste
    ?ugeo
    ?memberOfcode
  WHERE {{
    GRAPH <http://rdfdata.eionet.europa.eu/eurostat/data/env_waspac.rdf.gz> { 
    {
    _:env_waspac sdmx-dimension:timePeriod ?date . FILTER (?date >= "1997-01-01"^^xsd:date)
    _:env_waspac property:geo ?geo .
    _:env_waspac property:unit u:T .
    _:env_waspac property:wst_oper wst:GEN .
    _:env_waspac property:flow flow:DOMESTIC .
    _:env_waspac property:waste waste:W1501 .
    _:env_waspac sdmx-measure:obsValue ?waste .
     }}
    } UNION {
    GRAPH <http://rdfdata.eionet.europa.eu/eurostat/data/demo_pjan.rdf.gz> { 
    {
    _:demo_pjan sdmx-dimension:timePeriod ?date . FILTER (?date >= "1997-01-01"^^xsd:date)
    _:demo_pjan property:geo ?geo .
    _:demo_pjan sdmx-dimension:age a:TOTAL .
    _:demo_pjan property:sex s:T .
    _:demo_pjan sdmx-measure:obsValue ?population .     
    }}
  }
  ?geo skos:prefLabel ?country .
  ?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'))
}
GROUP BY ?date ?ugeo ORDER BY ?ugeo ?date