55% of cars in NZ

are second-hand imports, the vast majority of which come from Japan. Well, that was the proportion of cars registered in 2008 that were second-hand imports anyway. That figure has been coming down over the last few years (It reached a peak of 60% in 1999).
Source
Some background: As of the late 1990's, there's been no vehicle manufacture or assembly in NZ, along with no import tariffs. That means that second-hand cars from Japan are very cheap - and being generally only around 5 years old are attractive options for most people. So, NZ ends up with relatively few new cars, but also relatively few really old cars (because 5 year-old imports are so cheap).