Percentual change in the number of holdings and utilised agricultural area (UAA) by size class

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 skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX property: <http://rdfdata.eionet.europa.eu/eurostat/property#>
PREFIX geo: <http://dd.eionet.europa.eu/vocabulary/eurostat/geo/> 
PREFIX indic_ef: <http://dd.eionet.europa.eu/vocabulary/eurostat/indic_ef/>
PREFIX ontology: <http://rdfdata.eionet.europa.eu/eea/ontology/>
PREFIX countries: <http://rdfdata.eionet.europa.eu/eea/countries/>
PREFIX legtype: <http://dd.eionet.europa.eu/vocabulary/eurostat/legtype/>
PREFIX agrarea: <http://dd.eionet.europa.eu/vocabulary/eurostat/agrarea/>

SELECT DISTINCT
bif:either(?indic_ef = indic_ef:HOLD_HOLD, 'Number of holdings', 'Utilised agricultural area') as ?category
#?agrarea
bif:either(?agrarea = agrarea:HA0, 1,
(bif:either(?agrarea = agrarea:HA_LT2, 2,
(bif:either(?agrarea = agrarea:HA2-4, 3,
(bif:either(?agrarea = agrarea:HA5-9, 4,
(bif:either(?agrarea = agrarea:HA10-19, 5,
(bif:either(?agrarea = agrarea:HA20-29, 6,
(bif:either(?agrarea = agrarea:HA30-49, 7,
(bif:either(?agrarea = agrarea:HA50-99, 8, 
(bif:either(?agrarea = agrarea:HA_GE100, 9, 10))))))))))))))))) as ?order

?agrareaLabel
round(((?obsValue_last-?obsValue_first)/sum(?obsValue_first))*10000.0)/100.0 as ?obsValue
{{
  SELECT DISTINCT
    ?indic_ef
    ?agrarea
    ?agrareaLabel
    sum(?obsValue_first) as ?obsValue_first
    sum(?obsValue_last) as ?obsValue_last

  WHERE {{ 
    GRAPH <http://rdfdata.eionet.europa.eu/eurostat/data/ef_kvaareg.rdf.gz>  {{
      _:ef_kvaareg_first sdmx-dimension:timePeriod ?date_first .
      FILTER (year(?date_first)= 2005)
      _:ef_kvaareg_first property:legtype legtype:TOTAL .
      _:ef_kvaareg_first property:indic_ef ?indic_ef .
      _:ef_kvaareg_first sdmx-dimension:refArea ?geo .
      _:ef_kvaareg_first property:agrarea ?agrarea .
      _:ef_kvaareg_first sdmx-measure:obsValue ?obsValue_first .

      _:ef_kvaareg_last sdmx-dimension:timePeriod ?date_last .
      FILTER (year(?date_last)= 2010)
      _:ef_kvaareg_last property:legtype legtype:TOTAL .
      _:ef_kvaareg_last property:indic_ef ?indic_ef .
      _:ef_kvaareg_last sdmx-dimension:refArea ?geo .
      _:ef_kvaareg_last property:agrarea ?agrarea .
      _:ef_kvaareg_last sdmx-measure:obsValue ?obsValue_last .
      FILTER (?indic_ef in (indic_ef:HOLD_HOLD, indic_ef:AGRAREA_HA))
  }}
  ?eeageo owl:sameAs ?geo .
  ?eeageo ontology:memberOf countries:EU28 .
  ?agrarea rdfs:label ?agrareaLabel .
}}
GROUP BY ?indic_ef ?agrareaLabel ?agrarea
HAVING (sum(?obsValue_last)-sum(?obsValue_first)) != 0
}}