When did cars transition from the boxy to round look?

They were always kind of there, but cars with rounded edges started to stick out more around 1991-1995, 1995-1997 it was largely popular but you still people with 80s/early 90s boxy cars and there still a few new models in 1995-1997 with it, 1997-1998 and 1999 although it was predominately rounded many people were still using early 90s cars boxy cars even if it wasn't in fashion. Early 2000s you saw a drop of people with older cars, by the mid 2000s it was much less common to have or spot much distinctly older boxy older car. 

I remember when my dad got this tauraus ford around 1993 , compared to our previous typical cadallic car from like 1986, people in the 80s/90s used older cars for longer it wasn't like the 2000s/2010s.  

Unrelated but the 90s and the 00s were the decades of the bubbly cars