added some example variables for percentages and proportions
added some example variables for percentages and proportions

eHealthAfrica/formhub,wesley1001/formhub,GeoODK/formhub,spatialdev/onadata,SEL-Columbia/nmis,ehealthafrica-ci/formhub,GeoODK/formhub,sounay/flaminggo-test,awemulya/fieldsight-kobocat,eHealthAfrica/formhub,SEL-Columbia/nmis,eHealthAfrica/formhub,makinacorpus/formhub,smn/onadata,makinacorpus/formhub,SEL-Columbia/nmis,GeoODK/onadata,sounay/flaminggo-test,mainakibui/kobocat,piqoni/onadata,SEL-Columbia/nmis,hnjamba/onaclone,jomolinare/kobocat,piqoni/onadata,wesley1001/formhub,spatialdev/onadata,piqoni/onadata,ehealthafrica-ci/formhub,qlands/onadata,ehealthafrica-ci/onadata,GeoODK/onadata,makinacorpus/formhub,kobotoolbox/kobocat,awemulya/fieldsight-kobocat,awemulya/fieldsight-kobocat,ehealthafrica-ci/onadata,SEL-Columbia/formhub,jomolinare/kobocat,kobotoolbox/kobocat,SEL-Columbia/nmis,GeoODK/formhub,SEL-Columbia/formhub,ultimateprogramer/formhub,qlands/onadata,wesley1001/formhub,smn/onadata,sounay/flaminggo-test,SEL-Columbia/nmis,kobotoolbox/kobocat,sounay/flaminggo-test,ehealthafrica-ci/formhub,eHealthAfrica/formhub,hnjamba/onaclone,eHealthAfrica/onadata,awemulya/fieldsight-kobocat,jomolinare/kobocat,jomolinare/kobocat,hnjamba/onaclone,spatialdev/onadata,SEL-Columbia/formhub,ultimateprogramer/formhub,ultimateprogramer/formhub,mainakibui/kobocat,eHealthAfrica/onadata,GeoODK/onadata,spatialdev/onadata,qlands/onadata,qlands/onadata,makinacorpus/formhub,GeoODK/onadata,smn/onadata,mainakibui/kobocat,eHealthAfrica/onadata,ultimateprogramer/formhub,ehealthafrica-ci/formhub,hnjamba/onaclone,SEL-Columbia/formhub,kobotoolbox/kobocat,smn/onadata,piqoni/onadata,ehealthafrica-ci/onadata,wesley1001/formhub,ehealthafrica-ci/onadata,mainakibui/kobocat