In 2004, importing JDM cars became popular in Canada as highly sought after vehicles, such as the 1989 Nissan Skyline GT-R, became eligible to import under Canada's 15-year rule.[9] In contrast, importing grey market vehicles into the United States is much more difficult.[10] To avoid regulatory problems, most private individuals wait until EPA restrictions no longer apply to the desired vehicle, which is done on a rolling 25-year cycle.[11]