According to a survey, 44% of females enjoy watching horror films compared to 36% of males, differing from a TV channel's statistics. The survey also found that social class C2, consisting of skilled working class with below average incomes, enjoy horror films the most compared to other classes. There has been a large increase in the number of horror films produced from 229 in 1990 to 874 in 2006, likely due to DVDs providing efficient and inexpensive distribution for independent film companies.