Table:
religion
1992
2001
2011

number
%
number
%
number
%

christianity
7,350,016
86.6
6,638,870
83.73
4,487,554
60.9

-bulgarian orthodox church
7,274,479
85.71
6,552,751
82.64
4,374,135
59.4

-protestantism
22,067
0.26
42,308
0.53
64,476
0.9

-catholic church
53,470
0.63
43,811
0.55
48,945
0.7

islam
1,111,838
13.1
966,978
12.2
577,139
7.9

other
11,882
0.14
14,937
0.19
11,444
0.1

no religion
none
none
308.116
3.88
682,162
9.3

no answer
none
none
none
none
1,606,269
21.8

total population
8,487,317
100.0
7,928,901
100.0
7,364,570
100.0

Statement: according to the 2011 census, 21.8% of bulgarians did not respond to the question about religion.
Question: according to the 2011 census, what percent of bulgarians did not respond to the question about religion?
Answer: [21.8]