Mk2 was never tested by NCAP. It was tested, however, in the US (IIHS). It was among the best in its class, although not the best.
http://www.iihs.org/ratings/rating.aspx?id=118
http://www.iihs.org/ratings/ratingsbyseries.aspx?id=346
http://www.nadaguides.com/default.aspx?l=1...489&s=12671
Mk3 got the highest score in NCAP at the time of the test, and is still among the best.
As for Mk1, it looks rather average according to its 1995 test by NHTSA.
http://www.carfax.com/car_safety/ratings/S...S#SARcrashNHTSA