RDF-SPARQL query-based Dashboards

End-point:
Query:

PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> 
PREFIX skos: <http://www.w3.org/2004/02/skos/core#> 
PREFIX sdmx-dimension: <http://purl.org/linked-data/sdmx/2009/dimension#> 
PREFIX sdmx-measure: <http://purl.org/linked-data/sdmx/2009/measure#> 
PREFIX qb: <http://purl.org/linked-data/cube#> 
PREFIX year: <http://reference.data.gov.uk/id/year/> 
PREFIX property: <http://worldbank.270a.info/property/> 
PREFIX indicator: <http://worldbank.270a.info/classification/indicator/> 
PREFIX country: <http://worldbank.270a.info/classification/country/> 
PREFIX g-meta: <http://worldbank.270a.info/graph/meta> 
PREFIX g-indicators: <http://worldbank.270a.info/graph/world-development-indicators>

SELECT ?refPeriod ?refLocation ?obsValue WHERE { 
GRAPH g-indicators: { ?observation a qb:Observation ; property:indicator indicator:SL.UEM.TOTL.ZS ;
sdmx-dimension:refArea ?countryURI ;
sdmx-dimension:refPeriod ?refPeriodURI ;
sdmx-measure:obsValue ?obsValue . 
BIND(SUBSTR(STR(?refPeriodURI), 38, 4) AS ?refPeriod) 
FILTER (xsd:int(?refPeriod) = 1995 || xsd:int(?refPeriod) = 2000  || xsd:int(?refPeriod) = 2005 || xsd:int(?refPeriod) = 2009)
FILTER (?countryURI = country:ES || ?countryURI = country:FR  || ?countryURI = country:GB  || ?countryURI = country:DE )
} 
GRAPH g-meta: { ?countryURI skos:prefLabel ?refLocation . } } ORDER BY ASC(?refPeriod)   LIMIT 40