Trend of recycling municipal waste 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 sdmx-attribute: <http://purl.org/linked-data/sdmx/2009/attribute#> 
PREFIX property: <http://rdfdata.eionet.europa.eu/eurostat/property#> 
PREFIX unit: <http://dd.eionet.europa.eu/vocabulary/eurostat/unit/> 
PREFIX wst: <http://dd.eionet.europa.eu/vocabulary/eurostat/wst_oper/>
PREFIX geo: <http://dd.eionet.europa.eu/vocabulary/eurostat/geo/>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>


SELECT
year(?date) as ?date
bif:either(?geo = geo:DE, 'Germany', ?ugeo) as ?ugeo
sum(?RCY_M) as ?material_recycling 
sum(?RCY_OC) as ?composting_and_digestion 
( sum(?RCY_OC)+sum(?RCY_M) ) as ?total_recycling 
sum(?GEN) as ?waste_generated

round(( sum(?RCY_M)/ sum(?GEN) )*1000)/10.0 as ?material_recycling_perc
round(( sum(?RCY_OC)/ sum(?GEN) )*1000)/10.0 as ?composting_and_digestion_perc
round(( ( sum(?RCY_OC)+sum(?RCY_M) ) / sum(?GEN) )*1000)/10.0 as ?total_recycling_perc


WHERE { 
 GRAPH <http://rdfdata.eionet.europa.eu/eurostat/data/env_wasmun.rdf.gz> 
  { 
        _:env_wasmun sdmx-dimension:timePeriod ?date . FILTER (year(?date) > 2000)
	_:env_wasmun sdmx-dimension:refArea ?geo .
        _:env_wasmun sdmx-attribute:unitMeasure unit:THS_T .
        { 
	  _:env_wasmun property:wst_oper wst:GEN.
          _:env_wasmun sdmx-measure:obsValue ?GEN. 
	} UNION { 
	  _:env_wasmun property:wst_oper wst:RCY_M.
          _:env_wasmun sdmx-measure:obsValue ?RCY_M. 
        } UNION { 
	  _:env_wasmun property:wst_oper wst:RCY_OC . 
          _:env_wasmun sdmx-measure:obsValue ?RCY_OC . 
	} 
  } 
  ?geo rdfs:label ?ugeo . 

} 
GROUP BY ?date ?ugeo ?geo
ORDER BY ?ugeo ?date