Given the task definition and input, reply with output. This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning).
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.

Passage: Bulgaria is officially a secular nation and the Constitution guarantees the free exercise of religion but designates Orthodoxy as a "traditional" religion. In the 2001 census, 82.6% Bulgarians declared themselves Orthodox Christians, 12.2% Muslim, 1.2% other Christian denominations, 4% other religions and zero percent atheists. Most citizens of Bulgaria have associations at least nominally with the Bulgarian Orthodox Church. Founded in 870AD under the Patriarchate of Constantinople , the Bulgarian Orthodox Church had autocephalous status since 927 AD. The Church became subordinate within the Patriarchate of Constantinople, twice during the periods of Byzantine and Ottoman domination. It was re-established first in 1870 in the form of the Bulgarian Exarchate, and then in the 1950s as the Bulgarian Patriarchate.
How many Bulgarians in percent didn't declare themselves Orthodox Christians in the 2001 census?