I started noticing the trend right around 2000-2001, I guess right before or around the first Fast and Furious caught on.
And also, I definatly agree with Jason that it got REAL big when the immigration thing exploded in my area. Most of the worst ricers are immigrants (mostly Mexicans... legal or not I dont know), and I dont mean that in a demeaning or racist way at all, its just how it is.