Table: 10	Production and atmospheric Release							Expanded Data				Reporting Companies only
HFC-134a	(thousand metric tonnes)															(thousand metric tonnes)
				Cumulative
	Annual			Total				Short Banking Times				Medium Banking Times				Long Banking Times
	Production	Released		Production	Released	Unreleased		Sales	Released	Unreleased		Sales	Released	Unreleased		Sales	Released	Unreleased
1990	0.2	0.1		0.2	0.1	0.1		0.1	0.1	0.1		0.1	0.0	0.1		0.0	0.0	0.0
1991	2.2	0.2		2.4	0.3	2.1		0.2	0.1	0.0		2.2	0.2	2.0		0.0	0.0	0.0
1992	6.4	0.8		8.8	1.1	7.7		0.5	0.3	0.2		8.2	0.8	7.4		0.1	0.0	0.1
1993	26.5	3.6		35.3	4.7	30.6		2.2	1.4	0.9		32.7	3.2	29.4		0.4	0.1	0.3
1994	50.4	9.1		85.7	13.8	71.9		5.1	3.6	1.4		78.7	9.5	69.2		1.9	0.6	1.3
1995	73.8	19.8		159.5	33.6	125.9		15.5	10.3	5.2		140.0	21.9	118.0		4.0	1.4	2.6
1996	83.7	32.4		243.2	65.9	177.2		26.4	20.9	5.4		210.1	42.6	167.5		6.7	2.3	4.4
1997	97.9	42.3		341.1	108.3	232.8		34.7	30.5	4.2		296.0	74.0	222.0		10.4	3.7	6.6
1998	112.2	54.3		453.3	162.6	290.7		42.3	38.5	3.8		391.5	117.0	274.5		19.5	7.0	12.5
1999	131.8	69.7		585.1	232.3	352.8		57.6	50.0	7.6		500.0	172.1	327.8		27.5	10.2	17.3
2000	129.8	84.6		714.8	316.9	398.0		73.9	65.7	8.1		607.8	238.3	369.5		33.1	12.8	20.3
2001	134.0	96.4		848.8	413.3	435.5		87.4	80.6	6.8		714.9	314.6	400.4		46.5	18.1	28.3
2002	157.0	105.9		1005.8	519.2	486.6		103.2	95.3	7.9		845.5	400.9	444.5		57.1	23.0	34.1
2003	166.9	114.8		1172.7	634.0	538.7		115.6	109.4	6.2		989.7	496.6	493.1		67.4	28.0	39.4
2004	173.9	125.6		1346.5	759.6	586.9		132.5	124.1	8.5		1131.6	600.7	530.9		82.4	34.9	47.5
Notes
In previous reports, from 1997 to 2002 fugitive emissions were incorrectly calculated. This has now been rectified with small changes to the data for the years identified.
Emissions are calculated from production and categorised sales using "emission functions".
The emission function for "Long" banking times was changed in 2001 in view of the results of a survey commissioned by AFEAS:
	(Ashford P., 1999, Development of a global emission function for blowing agents used in closed cell foam, Final Report to AFEAS and
	McCulloch A., P.M. Midgley and P. Ashford, Releases of Refrigerant Gases (CFC-12, HCFC-22 and HFC-134a) to the Atmosphere, Atmos. Environ., 37, 889-902, 2003)
The survey showed that most (99%) of the HFC-134a in closed cell foams was used to blow expanded polystyrene, the emission function for which comprises
	32.5% loss in the year of manufacture and 3%/yr thereafter.
Columns affected by this change are shaded pale green/blue.
The emission function for "Short" banking time (e.g. aerosols) is the same as in previous reports (50% emitted in the year of manufacture and 100% the year after).
The emission function for "Medium" banking time (predominantly refrigeration) is the same as in previous reports (normally distributed about a
	mean of 4.5 years, with a total service lifetime of 10 years).
The collection of data for 2004 onwards is being performed by Cefic (the European Confederation of Chemical Industry Councils) whose Statistical Department has imposed
a measure of confidentiality that did not exist in previous AFEAS data. In addition to the existing rule that there should be three manufacturers,
the new rule prevents publication of data if one manufacturer reports more than 70% of the value in any one category.
The change does not affect the values for HFC-134a