gasprice	year
1.145	1991
1.119	1992
1.109	1993
1.098	1994
1.160	1995
1.226	1996
1.241	1997
1.073	1998
1.127	1999
1.502	2000
1.531	2001
1.333	2002
1.606	2003
1.849	2004