About: http://webisa.webdatacommons.org/161921327

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I suspect most of the answer is simply that people are more aware of income tax and how it works and understand national insurance less well.
http://www.w3.org/ns/prov#wasQuotedFrom	ukpollingreport.co.uk