In 2001, 26.1 percent of Willoughby residents were Catholics.
[['[TABLECONTEXT]', 'ITEM', 'Religious affiliation, top responses'], ['Religious affiliation, top responses', '2001', '26.1%'], ['[TABLECONTEXT]', '[TITLE]', 'City of Willoughby'], ['Religious affiliation, top responses', 'RESPONSE', 'Catholic']]