T-22. Oil and Natural Gas Acreage for FRS Companies
(Thousand Acres)
	2003	2004	2005	2006	2007	2008	2009
Net Acreage
U.S. Onshore
Developed	36721	38287	38702	39682	36760	39278	41691
Undeveloped	42891	39891	44631	48650	54662	56504	50420
U.S. Offshore
Developed	5375	5520	5106	4544	4381	4146	3784
Undeveloped	20875	22006	20917	18755	16022	17680	16438
Foreign
Developed	33952	33561	34990	36572	36206	36493	35023
Undeveloped	312769	273697	300277	291292	298319	290841	267900
Gross Acreage
U.S. Onshore
Developed	65367	64704	64550	62892	60567	62660	66091
Undeveloped	66918	62194	69544	75411	84186	86061	80344
U.S. Offshore
Developed	9331	9818	8947	7306	6937	6500	5969
Undeveloped	31134	32548	30772	26915	22961	23453	22649
Foreign
Developed	70516	65597	78233	92075	90538	89955	86040
Undeveloped	608666	532672	546357	509714	507220	489817	453631
Source: Energy Information Administration, Form EIA-28 (Financial Reporting System).