Prius was started in 1997.
Prius 1 (NHW10, NHW11) 1997–2003
Prius 2 (XW20) 2003–2009
This version has a classical Prius look.
Prius 2006
In 2006 it was upgraded to have AUX input (for Bluetooth music) and higher resolution display. Almost no changes from outside. Just the color of the upper part of the tail lights became transparent.
Prius 3 (XW30) 2009–2015
Nicer Prius. Has a plug-in version with 15kWh battery.
Prius 4 (XW50; 2015–present)
Prius 4 Plugin
Prius plugin has a dent in the middle of the spoiler.
Source: Wikipedia.
