what is the number of operations by an united states client?
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col : client | years of operation | area of operation | country | services row 1 : agoco | 1991-current | sarir field | libya | drilling, workover row 2 : lasmo | 1993-94 | wadi borjuj | libya | drilling, workover row 3 : waha | 1994 | el zahra | libya | drilling, workover row 4 : ipc-dublin | 1997-97 | kilwa | tanzania | drilling row 5 : omv | 1997 | field 103 | libya | drilling, workover row 6 : fina | 1997 | el hamada | libya | drilling, workover row 7 : marathon | 1998 | manzala field | egypt | drilling row 8 : khalda/repsol | 1998-99 | west desert | egypt | drilling row 9 : total | 1999-current | el mabrouk | libya | drilling row 10 : agiba-agip | 1999 | west desert | egypt | drilling row 11 : ipll | 1999-current | el naka field | libya | drilling row 12 : soc | 2000-current | soc fields | libya | drilling row 13 : veba | 2000 | different fields | libya | drilling, workover row 14 : perenco oil co. | 2000-01 | echirax concession | gabon | drilling row 15 : zueitina | 2001-current | field 103 | libya | drilling, workover
what is the number of operations by an united states client?
Client Years of Operation Area of Operation Country Services
Agoco 1991-current Sarir field Libya Drilling, workover
Lasmo 1993-94 Wadi Borjuj Libya Drilling, workover
Waha 1994 El Zahra Libya Drilling, workover
IPC-Dublin 1997-97 Kilwa Tanzania Drilling
OMV 1997 Field 103 Libya Drilling, workover
Fina 1997 El Hamada Libya Drilling, workover
Marathon 1998 Manzala field Egypt Drilling
Khalda/Repsol 1998-99 West Desert Egypt Drilling
Total 1999-current El Mabrouk Libya Drilling
Agiba-Agip 1999 West Desert Egypt Drilling
IPLL 1999-current El Naka field Libya Drilling
SOC 2000-current SOC fields Libya Drilling
Veba 2000 Different fields Libya Drilling, workover
Perenco Oil Co. 2000-01 EchiraX Concession Gabon Drilling
Zueitina 2001-current Field 103 Libya Drilling, workover
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