Statistics for Two-Digit Number Sequences

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clue	2-digit number	% Correct
consecutive multiples of 9	36, 45, 54, {63}	100%
consecutive square numbers	36, 49, 64, {81}	94%
decreasing consecutive primes x 10	110, 70, 50, 30, {20}	66%
consecutive prime numbers	47, 53, 59, 61, {67}	66%
letter numbers of consecutive vowels	1, 5, 9, 15, {21}	54%
12, 9, 6, 3 in binary	1100, 1001, 110, {11}	46%
first 4 numbers written as a single Roman numeral	1, 5, 10, {50}	31%
days in consecutive months	31, 31, 28, {31}	26%
decreasing consecutive cubes	343, 216, 125, {64}	26%
consecutive Fibonacci numbers	13, 21, 34, {55}	23%
20th century start and end dates of the 2 world wars	14, 18, 39, {45}	23%
Olympic years	28, 32, 36, 48, {52}	23%
20th century year of admission of last 4 US states	12, 12, 59, {59}	14%
20th century year of accession of last 4 UK monarchs	10, 36, 36, {52}	3%
first five 2-digit numbers alphabetically	18, 80, 88, 85, {84}	3%
first 8 digits of pi	31, 41, 59, {26}	0%