The demographics of Van are a greatly debated point, given the changing provincial borders. For example, in 1875 the province was divided; Van and Hakkari were separated, only to be rejoined in 1888, drastically changing the census numbers. Some writers argue that this merging was done to keep the Armenians from forming a majority. In 1862 it was estimated that in Van there were 90,100 Christians (including Syriac Christianity) and 95,100 Muslims. The French Consul in Van reported that in Van and Bitlis 51.46% were Kurds, 32.70% were Armenians and 5.53% were Turks. On the other hand, the Armenian Patriarchate of Constantinople estimated 185,000 Armenians in Van, 18,000 Assyrians, 72,000 Kurds, 47,000 Turks, 25,000 Yezidis and 3,000 Gypsies. Both sides have been accused of overcounting the numbers at the time given the revival of the Armenian Question and population statistics became important during the Berlin Conference.

Based on the above article, answer a question. For how many years were Van and Hakkari divided?
13