Table 2.7  Type of Heating in Occupied Housing Units, Selected Years, 1950-2005
Year	Coal 1	Distillate Fuel Oil	Kerosene		Liquefied Petroleum Gases	Natural Gas	Electricity	Wood	Solar	Other 2	None 3	Total
	Millions
1950	14,483,420	9,460,560		[4]	975,435	11,121,860	276,240	4,171,690	NA	769,390	1,567,686	42,826,281
1960	6,455,565	17,158,401		[4]	2,685,770	22,851,216	933,023	2,236,866	NA	223,015	480,019	53,023,875
1970	1,821,000	16,473,000		[4]	3,807,000	35,014,000	4,876,000	794,000	NA	266,000	395,000	63,446,000
1973	800,000	17,235,000		[4]	4,422,000	38,461,000	7,213,000	604,000	NA	151,000	452,000	69,338,000
1974	741,000	16,835,000		[4]	4,143,000	39,471,000	8,407,000	658,000	NA	90,000	484,000	70,829,000
1975	573,000	16,299,000		[4]	4,146,000	40,933,000	9,173,000	852,000	NA	78,000	468,000	72,522,000
1976	484,000	16,451,000		[4]	4,239,000	41,219,000	10,151,000	912,000	NA	86,000	463,000	74,005,000
1977	454,000	15,618,000	442,000		4,182,000	41,543,000	11,146,000	1,239,000	NA	150,000	507,000	75,281,000
1978	402,000	15,648,000	423,000		4,130,000	42,521,000	12,258,000	1,066,000	NA	121,000	597,000	77,166,000
1979	358,000	15,295,000	413,000		4,134,000	43,322,000	13,244,000	1,135,000	NA	100,000	570,000	78,571,000
1980	329,000	14,500,000	369,000		4,170,000	44,398,000	14,207,000	1,377,000	NA	110,000	613,000	80,073,000
1981	361,000	14,126,000	368,000		4,165,000	46,084,000	15,486,000	1,894,000	NA	102,000	589,000	83,175,000
1983 5	432,000	12,585,000	446,000		3,869,000	46,700,000	15,684,000	4,087,000	NA	158,000	677,000	84,638,000
1985	447,000	12,441,000	1,064,000		3,584,000	45,328,000	18,361,000	6,252,000	53,000	365,000	530,000	88,425,000
1987	407,000	12,738,000	1,075,000		3,659,000	45,959,000	20,608,000	5,453,000	45,000	284,000	660,000	90,888,000
1989	335,000	12,469,000	1,073,000		3,664,000	47,395,000	23,060,000	4,586,000	40,000	398,000	663,000	93,683,000
1991	319,000	11,473,000	989,000		3,882,000	47,018,000	23,714,000	4,443,000	33,000	414,000	861,000	93,146,000
1993	297,000	11,168,000	1,021,000		3,922,000	47,669,000	25,107,000	4,104,000	30,000	496,000	911,000	94,725,000
1995	210,000	10,975,000	1,055,000		4,251,000	49,203,000	26,769,000	3,533,000	16,000	637,000	1,044,000	97,693,000
1997	183,000	10,101,000	754,000		5,398,000	51,052,000	29,202,000	1,791,000	30,000	356,000	620,000	99,487,000
1999	168,000	10,026,000	724,000		5,905,000	52,366,000	31,142,000	1,703,000	19,000	205,000	544,000	102,802,000
2001 6	128,000	9,807,000	650,000		6,037,000	54,133,000	32,405,000	1,670,000	21,000	191,000	393,000	105,435,000
2003	126,000	9,501,000	635,000		6,134,000	54,928,000	32,341,000	1,560,000	17,000	158,000	441,000	105,841,000
2005	95,000	9,382,000	547,000		6,228,000	56,317,000	34,263,000	1,411,000	15,000	214,000	399,000	108,871,000
	Percent
1950	33.8	22.1		[4]	2.3	26.0	0.6	9.7	NA	1.8	3.7	100.0
1960	12.2	32.4		[4]	5.1	43.1	1.8	4.2	NA	.4	.9	100.0
1970	2.9	26.0		[4]	6.0	55.2	7.7	1.3	NA	.4	.6	100.0
1973	1.2	24.9		[4]	6.4	55.5	10.4	.9	NA	.2	.7	100.0
1974	1.0	23.8		[4]	5.8	55.7	11.9	.9	NA	.1	.7	100.0
1975	.8	22.5		[4]	5.7	56.4	12.6	1.2	NA	.1	.6	100.0
1976	.7	22.2		[4]	5.7	55.7	13.7	1.2	NA	.1	.6	100.0
1977	.6	20.7	.6		5.6	55.2	14.8	1.6	NA	.2	.7	100.0
1978	.5	20.3	.5		5.4	55.1	15.9	1.4	NA	.2	.8	100.0
1979	.5	19.5	.5		5.3	55.1	16.9	1.4	NA	.1	.7	100.0
1980	.4	18.1	.5		5.2	55.4	17.7	1.7	NA	.1	.8	100.0
1981	.4	17.0	.4		5.0	55.4	18.6	2.3	NA	.1	.7	100.0
1983 5	.5	14.9	.5		4.6	55.2	18.5	4.8	NA	.2	.8	100.0
1985	.5	14.1	1.2		4.1	51.3	20.8	7.1	.1	.4	.6	100.0
1987	.4	14.0	1.2		4.0	50.6	22.7	6.0	.1	.3	.7	100.0
1989	.4	13.3	1.1		3.9	50.6	24.6	4.9	(s)	.4	.7	100.0
1991	.3	12.3	1.1		4.2	50.5	25.5	4.8	(s)	.4	.9	100.0
1993	.3	11.8	1.1		4.1	50.3	26.5	4.3	(s)	.5	1.0	100.0
1995	.2	11.2	1.1		4.4	50.4	27.4	3.6	(s)	.7	1.1	100.0
1997	.2	10.2	.8		5.4	51.3	29.4	1.8	(s)	.4	.6	100.0
1999	.2	9.8	.7		5.7	50.9	30.3	1.7	(s)	.2	.5	100.0
2001 6	.1	9.3	.6		5.7	51.3	30.7	1.6	(s)	.2	.4	100.0
2003	.1	9.0	.6		5.8	51.9	30.6	1.5	(s)	.1	.4	100.0
2005	.1	8.6	.5		5.7	51.7	31.5	1.3	(s)	.2	.4	100.0
1Includes coal coke. 6Beginning in 2001, data are consistent with the 2000 Census.  For 2001 data consistent with the 1990 Census, see American Housing Survey for the United States: 2001. 2Includes briquettes (made of pitch and sawdust), coal dust, waste material (such as corncobs), purchased steam, and other fuels not separately displayed. NA=Not available.  (s)=Less than 0.05 percent.   3In 1950 and 1960, also includes nonreporting units, which totaled 997 and 2,000 units, respectively. Notes:  ·  Includes mobile homes and individual housing units in apartment buildings.  Housing units with more than one type of heating system are classified according to the principal type of heating system. ·  Totals may not equal sum of components due to independent rounding. 4Included in "Distillate Fuel Oil." Web Page:  For related information, see http://www.census.gov/hhes/www/ahs.html. 5Beginning in 1983, the American Housing Survey for the United States has been a biennial survey. Sources:  ·  1950, 1960, and 1970—Bureau of the Census, Census of Population and Housing.  ·  1973 forward—Bureau of the Census, American Housing Survey for the United States, biennial surveys, Table 2-5.