Milestones in the price of gasoline. Price is the nationwide average for a gallon of unleaded regular.

FIRSTS:

September 1979: First monthly average above $1.

May 19, 2004: Tops $2 for first time.

Sept. 3, 2005: Tops $3 for first time.

June 8 to July 25, 2008: Only period above $4.

1980: Top $1 for a full year ($1.25).

2005: Tops $2 for a full year ($2.30).

2008: Tops $3 for a full year ($3.27).

LASTS:

March 1999: Last month below $1.

March 25, 2009: Last day below $2.

Dec. 22, 2010: Last day below $3.

TODAY:

March 27, 2012: $3.90.

10 YEARS AGO:

March 27, 2002: $1.35.

Sources: Energy Information Agency, Oil Price Information Service.