year heating_degree_days
1980 3616.055
1981 3429.01
1982 3280.365
1983 3254.153
1984 3395.567
1985 3664.079
1986 3495.545
1987 3623.357
1988 3275.561
1989 3015.365
1990 3029.659
1991 3366.598
1992 3162.511
1993 3296.458
1994 2888.503
1995 3175.71
1996 3491.293
1997 3142.584
1998 3219.203
1999 3086.2
2000 2926.239
2001 3164.371
2002 3013.225
2003 3172.193
2004 3163.239
2005 3162.339
2006 3038.301
2007 2943.226
2008 3007.747
2009 3076.313