I think all Wikipedia Nobel Prize lists must be augmented by this crucial  information. This will also put in perspective the recent inflation of Nobel laureates in the sciences, which is easy to explain: most of the recent laureates had to share the prize while most of the early laureates got a full prize.  The lists of laureates by university or by country must take this into account as well. For example, Glauber (US), Hall (US) and Hänsch (Germany) shared the physics prize of 2005. But we cannot simply add 2.00 points to the US count and 1.0 to the German count. Instead we have to add 0.75 to the US count and 0.25 to the German count (Hänsch and Hall each got only 0.25 of the prize, Glauber got 0.5). Otherwise we'd violate the Nobel Prize conservation law:  The sum of the Nobel Prizes per year is constant; you may divide it among many laureates, but then the laureates necessarily become less outstanding on average.