Both figures compare apples to oranges. The 60%+ figure and the 70%+ figure that Farage likes to quote are an absolute case in point, they count up every EU regulation and quote that as a percentage of EU regulations + UK acts of parliament. This is clearly absurd since EU regulations are typically tiny, unimportant things. The last time we were discussing this figure I looked up the three of the most recent EU regulations at random. They (1) assigned a code to a particular kind of widescreen monitor for import purposes, (2) added a place in Italy that makes cheese into the list of geographically protected product names and the third one I forget but it was similar banal. To count those as equal to, say, the Health and Social Care Act 2012 or the act that upped tuition fees to £9k cannot be a sensible way to measure the relative impact of these parliaments.
It is probably impossible to define a single percentage that accurately describes the impact of EU on UK law but it's certainly the case that on all the big issues of the day the UK has the majority of the power.