Table 2 Fuel types and corresponding caloric value by year.

Fuel types of this study (i)	Fuels in Japan Prefecture Energy Statistics	Unit	Year (t)	H_i	I_i
				TJ	ton of carbon
				Measuring Unit	TJ
Coal		10³ t	1990	26.0	23.65
			2005	25.7	24.51
			2007	25.7	24.51
			2008	25.7	24.51
			2009	25.7	24.51
			2010	25.7	24.51
			2011	25.7	24.51
			2012	25.7	24.51
			2013	26.0	24.53
			2014	26.0	24.53
			2015	26.0	24.53
			2016	26.0	24.53
			2017	26.0	24.53
			2018	26.1	24.60
			2019	26.1	24.60
			2020	26.1	24.60
Oil		10³ kl	1990	38.3	18.66
			2005	38.1	18.66
			2007	38.1	18.66
			2008	38.1	18.66
			2009	38.1	18.66
			2010	38.2	18.66
			2011	38.2	18.66
			2012	38.1	18.66
			2013	38.2	19.00
			2014	38.2	19.00
			2015	38.2	19.00
			2016	38.2	19.00
			2017	38.2	19.00
			2018	38.2	18.98
			2019	38.1	18.98
			2020	38.1	18.98
Gas	Natural Gas	10³ t	1990	54.5	13.47
			2005	54.5	13.47
			2007	54.5	13.47
			2008	54.5	13.47
			2009	54.5	13.47
			2010	54.5	13.47
			2011	54.5	13.47
			2012	54.5	13.47
			2013	54.5	13.95
			2014	54.5	13.95
			2015	54.5	13.95
			2016	54.5	13.95
			2017	54.5	13.95
			2018	54.7	13.87
			2019	54.7	13.87
			2020	54.7	13.87
	Town Gas	10⁶ Nm³	1990	45.7	13.94
			2005	48.9	13.94
			2007	48.9	13.94
			2008	48.9	13.94
			2009	48.9	13.94
			2010	48.9	13.94
			2011	48.9	13.94
			2012	48.9	13.94
			2013	44.5	14.04
			2014	44.5	14.04
			2015	44.4	14.04
			2016	44.4	14.04
			2017	44.5	14.04
			2018	43.6	13.95
			2019	43.6	13.95
			2020	43.6	13.95

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