Just shy of two years of war in Western Europe before the French surrender. The following are the end totals:

Entente Status

Belgium has 17.5 Morale Points for a National Will of 1. They have lost a total of 103 Manpower points.
Britain has 156 Morale Points for a National Will of 3. They have lost a total of 410 British, 15 Indian, and 83 Canadian Manpower points. This is a grand total of 508 Manpower points.
France has 0 Morale Points for a National Will of 0. They have lost a total of 107 African, 143 Colonial, 13 Foreign, and 1190 Metropolitan Manpower points. This is a grand total of 1453 Manpower points.
Italy has 63 Morale Points for a National Will of 2. They have lost a total of 320 Manpower points.
Entente Equipment points lost are 1305.
Total Manpower points lost are 2384.

Central Powers Status

Germany has 484.5 Morale Points for a National Will of 3. They have lost a total of 190 Bavarian, 1070 German, 114 Saxon, and 73 Wurttemburg Manpower points. This is a grand total of 1333 Manpower points.
Austria/Hungary has 163.5 Morale Points for a National Will of 2. They have lost a total of 78 Manpower points.
Central Powers Equipment points lost are 850.
Total Manpower points lost are 1411.

It is obvious from the numbers above that the Central Powers won the war mostly through attrition. The drastic changes from February, 1916 to the end of July, 1916 show the effects of the prolonged German offensive which started in January, 1916 and kept up until the French surrendered. The final counts show that the Central Powers had a 50% edge in casualties over the Entente.